feat(auth): role-based permissions + user management (plan phase 1)

Adds the RBAC foundation the CRUD phases build on, and the first write
module (users). The platform was read-only: every controller was guarded
only by AuthenticatedGuard and UserRole was ADMIN|STAFF. The old PHP app
stored level+role but enforced neither, so this is a fresh design.

Permission model (server-authoritative):
- UserRole expanded to an ordered rank ADMIN > MANAGER > STAFF > VIEWER.
  VIEWER is the read-only role; STAFF+ can write.
- auth/abilities.ts: ROLE_RANK + ABILITY_MIN matrix + can()/abilitiesFor().
- @RequireAbility decorator + AbilityGuard enforce it on write routes;
  reads stay on AuthenticatedGuard so any logged-in user can read.
- /auth/login and /auth/me now return the resolved abilities map, so the
  web gates its UI off one payload instead of duplicating the rules.

User management (ADMIN-only, ability "user:manage"):
- UsersService gains list/create/update/resetPassword (argon2), never
  returns passwordHash; blocks self-deactivation and self-demotion;
  maps duplicate email to 409.
- UsersController: GET/POST /users, PATCH /users/:id,
  POST /users/:id/reset-password.
- Every mutation logged via new AuditService over the existing
  ActivityLog model (global CommonModule).

Web:
- AuthContext + useAuth/useCan; AppShell provides the user and gates the
  new "Usuarios" nav entry on user:manage; shows the user's role.
- /usuarios admin page: list + create/edit form + password reset +
  active toggle, Spanish-first, reusing existing card/table/field styles.

Schema pushed to dev (enum only, non-destructive). Verified end-to-end
against dev: admin CRUD works, VIEWER writes 403 while reads 200,
self-lockout guards and duplicate-email 409 all hold.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/api/src/app.module.ts

@@ -1,6 +1,7 @@
 import { Module } from "@nestjs/common";
 import { ConfigModule } from "@nestjs/config";
 import { PrismaModule } from "./prisma/prisma.module";
+import { CommonModule } from "./common/common.module";
 import { UsersModule } from "./users/users.module";
 import { AuthModule } from "./auth/auth.module";
 import { CustomersModule } from "./customers/customers.module";
@@ -14,6 +15,7 @@ import { AppController } from "./app.controller";
   imports: [
     ConfigModule.forRoot({ isGlobal: true }),
     PrismaModule,
+    CommonModule,
     UsersModule,
     AuthModule,
     CustomersModule,

apps/api/src/auth/abilities.ts

@@ -0,0 +1,67 @@
+// Server-authoritative permission matrix. Roles form an ordered rank
+// (ADMIN > MANAGER > STAFF > VIEWER — this is the "level" concept); every
+// write action carries a minimum rank. VIEWER holds rank 0 and is the
+// read-only role. Reads are not listed here — they stay on AuthenticatedGuard
+// alone, so any logged-in user (including VIEWER) can read.
+//
+// This is the single source of truth: the API enforces it via AbilityGuard and
+// ships the resolved per-user map to the web through /auth/me, so the UI never
+// keeps its own copy of the rules.
+
+export type Role = "ADMIN" | "MANAGER" | "STAFF" | "VIEWER";
+
+export const ROLE_RANK: Record<Role, number> = {
+  VIEWER: 0,
+  STAFF: 1,
+  MANAGER: 2,
+  ADMIN: 3,
+};
+
+export type Ability =
+  | "customer:create"
+  | "customer:update"
+  | "customer:delete"
+  | "policy:create"
+  | "policy:update"
+  | "policy:delete"
+  | "property:create"
+  | "property:update"
+  | "property:delete"
+  | "ledger:create"
+  | "ledger:void"
+  | "bank:create"
+  | "bank:void"
+  | "lookup:manage"
+  | "user:manage";
+
+/** Minimum role required for each ability. */
+export const ABILITY_MIN: Record<Ability, Role> = {
+  "customer:create": "STAFF",
+  "customer:update": "STAFF",
+  "customer:delete": "ADMIN",
+  "policy:create": "STAFF",
+  "policy:update": "STAFF",
+  "policy:delete": "MANAGER",
+  "property:create": "STAFF",
+  "property:update": "STAFF",
+  "property:delete": "MANAGER",
+  "ledger:create": "STAFF",
+  "ledger:void": "MANAGER",
+  "bank:create": "STAFF",
+  "bank:void": "MANAGER",
+  "lookup:manage": "MANAGER",
+  "user:manage": "ADMIN",
+};
+
+export const ALL_ABILITIES = Object.keys(ABILITY_MIN) as Ability[];
+
+export function can(role: Role, ability: Ability): boolean {
+  return ROLE_RANK[role] >= ROLE_RANK[ABILITY_MIN[ability]];
+}
+
+/** Resolved {ability: boolean} map for a role — sent to the web via /auth/me. */
+export function abilitiesFor(role: Role): Record<Ability, boolean> {
+  return Object.fromEntries(
+    ALL_ABILITIES.map((a) => [a, can(role, a)]),
+  ) as Record<Ability, boolean>;
+}

apps/api/src/auth/ability.guard.ts

@@ -0,0 +1,36 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  ForbiddenException,
+  Injectable,
+} from "@nestjs/common";
+import { Reflector } from "@nestjs/core";
+import { Request } from "express";
+import { ABILITY_KEY } from "./require-ability.decorator";
+import { Ability, Role, can } from "./abilities";
+
+/**
+ * Enforces the ability matrix (abilities.ts) against req.user.role. A route
+ * with no @RequireAbility passes through untouched — this guard only gates the
+ * routes that declare one. It does NOT check authentication; always list it
+ * after AuthenticatedGuard so an unauthenticated request is rejected first.
+ */
+@Injectable()
+export class AbilityGuard implements CanActivate {
+  constructor(private readonly reflector: Reflector) {}
+
+  canActivate(context: ExecutionContext): boolean {
+    const ability = this.reflector.getAllAndOverride<Ability | undefined>(
+      ABILITY_KEY,
+      [context.getHandler(), context.getClass()],
+    );
+    if (!ability) return true;
+
+    const req = context.switchToHttp().getRequest<Request>();
+    const user = req.user as { role?: Role } | undefined;
+    if (!user?.role || !can(user.role, ability)) {
+      throw new ForbiddenException("No tiene permisos para esta acción");
+    }
+    return true;
+  }
+}

apps/api/src/auth/auth.controller.ts

@@ -3,6 +3,14 @@ import { Request, Response } from "express";
 import { LocalAuthGuard } from "./local-auth.guard";
 import { AuthenticatedGuard } from "./authenticated.guard";
 import { LoginDto } from "./login.dto";
+import { abilitiesFor, Role } from "./abilities";
+
+/** Attach the resolved ability map so the web can gate its UI off one payload. */
+function withAbilities(user: unknown) {
+  const u = user as { role?: Role } | undefined;
+  if (!u?.role) return u;
+  return { ...u, abilities: abilitiesFor(u.role) };
+}
 
 @Controller("auth")
 export class AuthController {
@@ -13,13 +21,13 @@ export class AuthController {
   @Post("login")
   @HttpCode(200)
   login(@Req() req: Request, @Res({ passthrough: true }) _res: Response, _body?: LoginDto) {
-    return req.user;
+    return withAbilities(req.user);
   }
 
   @UseGuards(AuthenticatedGuard)
   @Get("me")
   me(@Req() req: Request) {
-    return req.user;
+    return withAbilities(req.user);
   }
 
   @Post("logout")

apps/api/src/auth/require-ability.decorator.ts

@@ -0,0 +1,12 @@
+import { SetMetadata } from "@nestjs/common";
+import type { Ability } from "./abilities";
+
+export const ABILITY_KEY = "required_ability";
+
+/**
+ * Tags a write route with the ability it requires. Pair with
+ * `@UseGuards(AuthenticatedGuard, AbilityGuard)` — AuthenticatedGuard proves
+ * the session, AbilityGuard checks this ability against the user's role.
+ */
+export const RequireAbility = (ability: Ability) =>
+  SetMetadata(ABILITY_KEY, ability);

apps/api/src/common/audit.service.ts

@@ -0,0 +1,34 @@
+import { Injectable } from "@nestjs/common";
+import { Prisma } from "@jorgecuadros/database";
+import { PrismaService } from "../prisma/prisma.service";
+
+/**
+ * Thin writer over the existing ActivityLog model. Every mutating route calls
+ * this so who-did-what is recorded — the structural replacement for the old
+ * PHP app's scattered Logger calls. Best-effort: a logging failure must never
+ * fail the underlying write, so callers `void audit.log(...)` without awaiting.
+ */
+@Injectable()
+export class AuditService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async log(
+    userId: string | null | undefined,
+    event: string,
+    message?: Record<string, unknown>,
+    level = "info",
+  ): Promise<void> {
+    try {
+      await this.prisma.activityLog.create({
+        data: {
+          userId: userId ?? undefined,
+          event,
+          level,
+          message: (message as Prisma.InputJsonValue) ?? undefined,
+        },
+      });
+    } catch {
+      /* never let audit logging break a real write */
+    }
+  }
+}

apps/api/src/common/common.module.ts

@@ -0,0 +1,9 @@
+import { Global, Module } from "@nestjs/common";
+import { AuditService } from "./audit.service";
+
+@Global()
+@Module({
+  providers: [AuditService],
+  exports: [AuditService],
+})
+export class CommonModule {}

apps/api/src/users/create-user.dto.ts

@@ -0,0 +1,21 @@
+import { IsEmail, IsEnum, IsOptional, IsString, MinLength } from "class-validator";
+import { UserRole } from "@jorgecuadros/database";
+
+export class CreateUserDto {
+  @IsString()
+  @MinLength(1)
+  name!: string;
+
+  @IsEmail()
+  email!: string;
+
+  @IsString()
+  @MinLength(8)
+  password!: string;
+
+  @IsEnum(UserRole)
+  role!: UserRole;
+
+  @IsOptional()
+  active?: boolean;
+}

apps/api/src/users/reset-password.dto.ts

@@ -0,0 +1,7 @@
+import { IsString, MinLength } from "class-validator";
+
+export class ResetPasswordDto {
+  @IsString()
+  @MinLength(8)
+  password!: string;
+}

apps/api/src/users/update-user.dto.ts

@@ -0,0 +1,22 @@
+import { IsBoolean, IsEmail, IsEnum, IsOptional, IsString, MinLength } from "class-validator";
+import { UserRole } from "@jorgecuadros/database";
+
+/** Password changes go through the dedicated reset-password route, not here. */
+export class UpdateUserDto {
+  @IsOptional()
+  @IsString()
+  @MinLength(1)
+  name?: string;
+
+  @IsOptional()
+  @IsEmail()
+  email?: string;
+
+  @IsOptional()
+  @IsEnum(UserRole)
+  role?: UserRole;
+
+  @IsOptional()
+  @IsBoolean()
+  active?: boolean;
+}

apps/api/src/users/users.controller.ts

@@ -0,0 +1,72 @@
+import {
+  Body,
+  Controller,
+  Get,
+  Param,
+  Patch,
+  Post,
+  Req,
+  UseGuards,
+} from "@nestjs/common";
+import { Request } from "express";
+import { AuthenticatedGuard } from "../auth/authenticated.guard";
+import { AbilityGuard } from "../auth/ability.guard";
+import { RequireAbility } from "../auth/require-ability.decorator";
+import { AuditService } from "../common/audit.service";
+import { UsersService } from "./users.service";
+import { CreateUserDto } from "./create-user.dto";
+import { UpdateUserDto } from "./update-user.dto";
+import { ResetPasswordDto } from "./reset-password.dto";
+
+/** Every route here is ADMIN-only (ability "user:manage"). */
+@UseGuards(AuthenticatedGuard, AbilityGuard)
+@RequireAbility("user:manage")
+@Controller("users")
+export class UsersController {
+  constructor(
+    private readonly users: UsersService,
+    private readonly audit: AuditService,
+  ) {}
+
+  private actingId(req: Request): string {
+    return (req.user as { id: string }).id;
+  }
+
+  @Get()
+  list() {
+    return this.users.list();
+  }
+
+  @Post()
+  async create(@Body() dto: CreateUserDto, @Req() req: Request) {
+    const user = await this.users.create(dto);
+    void this.audit.log(this.actingId(req), "user.create", {
+      userId: user.id,
+      email: user.email,
+      role: user.role,
+    });
+    return user;
+  }
+
+  @Patch(":id")
+  async update(
+    @Param("id") id: string,
+    @Body() dto: UpdateUserDto,
+    @Req() req: Request,
+  ) {
+    const user = await this.users.update(id, dto, this.actingId(req));
+    void this.audit.log(this.actingId(req), "user.update", { userId: id, changes: dto });
+    return user;
+  }
+
+  @Post(":id/reset-password")
+  async resetPassword(
+    @Param("id") id: string,
+    @Body() dto: ResetPasswordDto,
+    @Req() req: Request,
+  ) {
+    const user = await this.users.resetPassword(id, dto.password);
+    void this.audit.log(this.actingId(req), "user.reset_password", { userId: id });
+    return user;
+  }
+}

apps/api/src/users/users.module.ts

@@ -1,8 +1,10 @@
 import { Module } from "@nestjs/common";
 import { UsersService } from "./users.service";
+import { UsersController } from "./users.controller";
 
 @Module({
   providers: [UsersService],
+  controllers: [UsersController],
   exports: [UsersService],
 })
 export class UsersModule {}

apps/api/src/users/users.service.ts

@@ -1,11 +1,35 @@
-import { Injectable } from "@nestjs/common";
+import {
-import { PrismaService } from "../prisma/prisma.service";
+  BadRequestException,
+  ConflictException,
+  Injectable,
+  NotFoundException,
+} from "@nestjs/common";
+import * as argon2 from "argon2";
+import { Prisma } from "@jorgecuadros/database";
 import type { User } from "@jorgecuadros/database";
+import { PrismaService } from "../prisma/prisma.service";
+import { CreateUserDto } from "./create-user.dto";
+import { UpdateUserDto } from "./update-user.dto";
+
+/** Shape returned to the UI — never carries passwordHash. */
+const safeSelect = {
+  id: true,
+  name: true,
+  email: true,
+  role: true,
+  active: true,
+  createdAt: true,
+  updatedAt: true,
+} satisfies Prisma.UserSelect;
+
+export type SafeUserRow = Prisma.UserGetPayload<{ select: typeof safeSelect }>;
 
 @Injectable()
 export class UsersService {
   constructor(private readonly prisma: PrismaService) {}
 
+  // --- used by auth (need the hash / full row) -----------------------------
+
   findByEmail(email: string): Promise<User | null> {
     return this.prisma.user.findUnique({ where: { email } });
   }
@@ -13,4 +37,89 @@ export class UsersService {
   findById(id: string): Promise<User | null> {
     return this.prisma.user.findUnique({ where: { id } });
   }
+
+  // --- admin CRUD (safe rows only) -----------------------------------------
+
+  list(): Promise<SafeUserRow[]> {
+    return this.prisma.user.findMany({
+      orderBy: [{ active: "desc" }, { name: "asc" }],
+      select: safeSelect,
+    });
+  }
+
+  async create(dto: CreateUserDto): Promise<SafeUserRow> {
+    const passwordHash = await argon2.hash(dto.password);
+    try {
+      return await this.prisma.user.create({
+        data: {
+          name: dto.name,
+          email: dto.email,
+          passwordHash,
+          role: dto.role,
+          active: dto.active ?? true,
+        },
+        select: safeSelect,
+      });
+    } catch (e) {
+      throw this.mapError(e);
+    }
+  }
+
+  /**
+   * `actingUserId` is the admin making the change — used to stop an admin from
+   * locking themselves out (deactivating or demoting their own account).
+   */
+  async update(
+    id: string,
+    dto: UpdateUserDto,
+    actingUserId: string,
+  ): Promise<SafeUserRow> {
+    await this.ensureExists(id);
+
+    if (id === actingUserId) {
+      if (dto.active === false) {
+        throw new BadRequestException("No puede desactivar su propia cuenta");
+      }
+      if (dto.role && dto.role !== "ADMIN") {
+        throw new BadRequestException("No puede quitarse su propio rol de administrador");
+      }
+    }
+
+    try {
+      return await this.prisma.user.update({
+        where: { id },
+        data: {
+          name: dto.name,
+          email: dto.email,
+          role: dto.role,
+          active: dto.active,
+        },
+        select: safeSelect,
+      });
+    } catch (e) {
+      throw this.mapError(e);
+    }
+  }
+
+  async resetPassword(id: string, password: string): Promise<SafeUserRow> {
+    await this.ensureExists(id);
+    const passwordHash = await argon2.hash(password);
+    return this.prisma.user.update({
+      where: { id },
+      data: { passwordHash },
+      select: safeSelect,
+    });
+  }
+
+  private async ensureExists(id: string): Promise<void> {
+    const found = await this.prisma.user.findUnique({ where: { id }, select: { id: true } });
+    if (!found) throw new NotFoundException(`Usuario ${id} no encontrado`);
+  }
+
+  private mapError(e: unknown): Error {
+    if (e instanceof Prisma.PrismaClientKnownRequestError && e.code === "P2002") {
+      return new ConflictException("Ya existe un usuario con ese correo");
+    }
+    return e as Error;
+  }
 }

apps/web/src/app/globals.css

@@ -267,12 +267,46 @@ button {
   font-size: 13px;
   color: rgba(242, 239, 231, 0.7);
 }
+.appbar-user-name {
+  display: inline-flex;
+  flex-direction: column;
+  line-height: 1.2;
+}
+.appbar-user-role {
+  font-size: 11px;
+  color: rgba(242, 239, 231, 0.45);
+}
 @media (max-width: 640px) {
   .appbar-user .appbar-user-name {
     display: none;
   }
 }
 
+/* ============================================================================
+   Admin form grid (users, and future CRUD forms)
+   ========================================================================== */
+.form-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+  gap: 16px;
+}
+.form-actions {
+  display: flex;
+  gap: 10px;
+  margin-top: 18px;
+  flex-wrap: wrap;
+}
+.row-actions {
+  display: flex;
+  gap: 8px;
+  justify-content: flex-end;
+}
+.inline-form-note {
+  font-size: 13px;
+  color: var(--muted, #6b7280);
+  margin: 4px 0 14px;
+}
+
 /* ============================================================================
    Buttons
    ========================================================================== */

apps/web/src/app/usuarios/page.tsx

@@ -0,0 +1,327 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { AppShell } from "@/components/AppShell";
+import { useAuth, useCan } from "@/lib/abilities";
+import { ROLE_LABEL, ROLES_DESC } from "@/lib/labels";
+import {
+  createUser,
+  listUsers,
+  resetUserPassword,
+  updateUser,
+} from "@/lib/api";
+import type { Role, UserRow } from "@/lib/types";
+
+export default function UsuariosPage() {
+  return (
+    <AppShell>
+      <UsuariosAdmin />
+    </AppShell>
+  );
+}
+
+type FormState = {
+  name: string;
+  email: string;
+  password: string;
+  role: Role;
+  active: boolean;
+};
+
+const EMPTY_FORM: FormState = {
+  name: "",
+  email: "",
+  password: "",
+  role: "STAFF",
+  active: true,
+};
+
+function UsuariosAdmin() {
+  const me = useAuth();
+  const allowed = useCan("user:manage");
+
+  const [users, setUsers] = useState<UserRow[] | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [notice, setNotice] = useState<string | null>(null);
+
+  // null = create mode; a user id = editing that row.
+  const [editingId, setEditingId] = useState<string | null>(null);
+  const [form, setForm] = useState<FormState>(EMPTY_FORM);
+  const [saving, setSaving] = useState(false);
+
+  // Inline "reset password" target + value.
+  const [pwTarget, setPwTarget] = useState<string | null>(null);
+  const [pwValue, setPwValue] = useState("");
+
+  function refresh() {
+    listUsers()
+      .then(setUsers)
+      .catch((e) => setError(e?.message ?? "No se pudieron cargar los usuarios."));
+  }
+
+  useEffect(() => {
+    if (allowed) refresh();
+  }, [allowed]);
+
+  if (!allowed) {
+    return (
+      <div className="page-head">
+        <h1 className="page-title">Usuarios</h1>
+        <div className="state-box state-error">
+          No tiene permisos para administrar usuarios.
+        </div>
+      </div>
+    );
+  }
+
+  function startCreate() {
+    setEditingId(null);
+    setForm(EMPTY_FORM);
+    setNotice(null);
+    setError(null);
+  }
+
+  function startEdit(u: UserRow) {
+    setEditingId(u.id);
+    setForm({ name: u.name, email: u.email, password: "", role: u.role, active: u.active });
+    setNotice(null);
+    setError(null);
+  }
+
+  async function submit(e: React.FormEvent) {
+    e.preventDefault();
+    setSaving(true);
+    setError(null);
+    setNotice(null);
+    try {
+      if (editingId) {
+        await updateUser(editingId, {
+          name: form.name,
+          email: form.email,
+          role: form.role,
+          active: form.active,
+        });
+        setNotice("Usuario actualizado.");
+      } else {
+        await createUser({
+          name: form.name,
+          email: form.email,
+          password: form.password,
+          role: form.role,
+          active: form.active,
+        });
+        setNotice("Usuario creado.");
+      }
+      startCreate();
+      refresh();
+    } catch (e2) {
+      setError((e2 as Error)?.message ?? "No se pudo guardar el usuario.");
+    } finally {
+      setSaving(false);
+    }
+  }
+
+  async function submitPassword(id: string) {
+    setError(null);
+    try {
+      await resetUserPassword(id, pwValue);
+      setPwTarget(null);
+      setPwValue("");
+      setNotice("Contraseña restablecida.");
+    } catch (e) {
+      setError((e as Error)?.message ?? "No se pudo restablecer la contraseña.");
+    }
+  }
+
+  return (
+    <>
+      <div className="page-head">
+        <h1 className="page-title">Usuarios</h1>
+      </div>
+
+      {error && <div className="state-box state-error">{error}</div>}
+      {notice && <div className="state-box">{notice}</div>}
+
+      {/* Create / edit form */}
+      <div className="card" style={{ padding: 20, marginBottom: 20 }}>
+        <h2 className="section-title" style={{ marginBottom: 4 }}>
+          {editingId ? "Editar usuario" : "Nuevo usuario"}
+        </h2>
+        <p className="inline-form-note">
+          El rol define el acceso: Solo lectura no puede escribir; Personal y
+          superior sí. Administrador gestiona usuarios.
+        </p>
+        <form onSubmit={submit}>
+          <div className="form-grid">
+            <label className="field">
+              <span className="field-label">Nombre</span>
+              <input
+                className="input"
+                required
+                value={form.name}
+                onChange={(e) => setForm({ ...form, name: e.target.value })}
+              />
+            </label>
+            <label className="field">
+              <span className="field-label">Correo</span>
+              <input
+                className="input"
+                type="email"
+                required
+                value={form.email}
+                onChange={(e) => setForm({ ...form, email: e.target.value })}
+              />
+            </label>
+            {!editingId && (
+              <label className="field">
+                <span className="field-label">Contraseña (mín. 8)</span>
+                <input
+                  className="input"
+                  type="password"
+                  required
+                  minLength={8}
+                  value={form.password}
+                  onChange={(e) => setForm({ ...form, password: e.target.value })}
+                />
+              </label>
+            )}
+            <label className="field">
+              <span className="field-label">Rol</span>
+              <select
+                className="select"
+                value={form.role}
+                onChange={(e) => setForm({ ...form, role: e.target.value as Role })}
+              >
+                {ROLES_DESC.map((r) => (
+                  <option key={r} value={r}>
+                    {ROLE_LABEL[r]}
+                  </option>
+                ))}
+              </select>
+            </label>
+            <label className="field" style={{ justifyContent: "flex-end" }}>
+              <span className="field-label">Activo</span>
+              <input
+                type="checkbox"
+                checked={form.active}
+                disabled={editingId === me?.id}
+                onChange={(e) => setForm({ ...form, active: e.target.checked })}
+              />
+            </label>
+          </div>
+          <div className="form-actions">
+            <button type="submit" className="btn btn-primary" disabled={saving}>
+              {saving ? "Guardando…" : editingId ? "Guardar cambios" : "Crear usuario"}
+            </button>
+            {editingId && (
+              <button type="button" className="btn btn-outline" onClick={startCreate}>
+                Cancelar
+              </button>
+            )}
+          </div>
+        </form>
+      </div>
+
+      {/* List */}
+      <div className="card">
+        {users === null ? (
+          <div className="empty-inline">
+            <span className="spinner" aria-label="Cargando" />
+          </div>
+        ) : users.length === 0 ? (
+          <div className="empty-inline">Sin usuarios.</div>
+        ) : (
+          <div className="tx-scroll">
+            <table className="tx-table">
+              <thead>
+                <tr>
+                  <th>Nombre</th>
+                  <th>Correo</th>
+                  <th>Rol</th>
+                  <th>Estado</th>
+                  <th className="num">Acciones</th>
+                </tr>
+              </thead>
+              <tbody>
+                {users.map((u) => (
+                  <tr key={u.id}>
+                    <td>
+                      {u.name}
+                      {u.id === me?.id && (
+                        <span className="muted"> (usted)</span>
+                      )}
+                    </td>
+                    <td className="mono">{u.email}</td>
+                    <td>
+                      <span className="badge badge-neutral">{ROLE_LABEL[u.role]}</span>
+                    </td>
+                    <td>
+                      <span
+                        className={`badge ${u.active ? "badge-positive" : "badge-negative"}`}
+                      >
+                        {u.active ? "Activo" : "Inactivo"}
+                      </span>
+                    </td>
+                    <td>
+                      {pwTarget === u.id ? (
+                        <div className="row-actions">
+                          <input
+                            className="input"
+                            type="password"
+                            placeholder="Nueva contraseña"
+                            minLength={8}
+                            value={pwValue}
+                            onChange={(e) => setPwValue(e.target.value)}
+                            style={{ maxWidth: 180 }}
+                          />
+                          <button
+                            className="btn btn-primary"
+                            type="button"
+                            disabled={pwValue.length < 8}
+                            onClick={() => submitPassword(u.id)}
+                          >
+                            Guardar
+                          </button>
+                          <button
+                            className="btn btn-ghost"
+                            type="button"
+                            onClick={() => {
+                              setPwTarget(null);
+                              setPwValue("");
+                            }}
+                          >
+                            Cancelar
+                          </button>
+                        </div>
+                      ) : (
+                        <div className="row-actions">
+                          <button
+                            className="btn btn-outline"
+                            type="button"
+                            onClick={() => startEdit(u)}
+                          >
+                            Editar
+                          </button>
+                          <button
+                            className="btn btn-ghost"
+                            type="button"
+                            onClick={() => {
+                              setPwTarget(u.id);
+                              setPwValue("");
+                            }}
+                          >
+                            Contraseña
+                          </button>
+                        </div>
+                      )}
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+    </>
+  );
+}

apps/web/src/components/AppShell.tsx

@@ -4,19 +4,23 @@ import { useEffect, useState, type ReactNode } from "react";
 import { usePathname, useRouter } from "next/navigation";
 import Link from "next/link";
 import { logout, me } from "@/lib/api";
-import type { AuthUser } from "@/lib/types";
+import { AuthContext, can } from "@/lib/abilities";
+import { ROLE_LABEL } from "@/lib/labels";
+import type { AuthUser, Ability } from "@/lib/types";
 
 /**
  * Authenticated shell: gates on /auth/me, redirects to /login when the
  * session is missing, renders the brand header + logout, and wraps page
- * content. Used by every authenticated page.
+ * content. Provides the AuthContext so any page can read the user's
+ * abilities. Used by every authenticated page.
  */
-const NAV = [
+const NAV: { href: string; label: string; ability?: Ability }[] = [
   { href: "/clientes", label: "Clientes" },
   { href: "/servicios", label: "Propiedades" },
   { href: "/polizas", label: "Pólizas" },
   { href: "/estado-cuenta", label: "Estado de cuenta" },
   { href: "/banco", label: "Chequera" },
+  { href: "/usuarios", label: "Usuarios", ability: "user:manage" },
 ];
 
 export function AppShell({ children }: { children: ReactNode }) {
@@ -69,7 +73,7 @@ export function AppShell({ children }: { children: ReactNode }) {
   }
 
   return (
-    <>
+    <AuthContext.Provider value={user}>
       <header className="appbar">
         <div className="appbar-inner">
           <Link href="/clientes" className="brand">
@@ -82,7 +86,8 @@ export function AppShell({ children }: { children: ReactNode }) {
             </span>
           </Link>
           <nav className="appbar-nav" aria-label="Principal">
-            {NAV.map((item) => {
+            {NAV.filter((item) => !item.ability || can(user, item.ability)).map(
+              (item) => {
                 const active = pathname?.startsWith(item.href) ?? false;
                 return (
                   <Link
@@ -94,12 +99,16 @@ export function AppShell({ children }: { children: ReactNode }) {
                     {item.label}
                   </Link>
                 );
-            })}
+              },
+            )}
           </nav>
           <span className="appbar-spacer" />
           <div className="appbar-user">
             {user && (
-              <span className="appbar-user-name">{user.name}</span>
+              <span className="appbar-user-name">
+                {user.name}
+                <span className="appbar-user-role">{ROLE_LABEL[user.role]}</span>
+              </span>
             )}
             <button
               type="button"
@@ -113,6 +122,6 @@ export function AppShell({ children }: { children: ReactNode }) {
         </div>
       </header>
       <main className="shell-main">{children}</main>
-    </>
+    </AuthContext.Provider>
   );
 }

apps/web/src/lib/abilities.ts

@@ -0,0 +1,24 @@
+// UI-side permission helpers. The rules themselves live server-side
+// (apps/api/src/auth/abilities.ts) and arrive resolved on `user.abilities` via
+// /auth/me — this module just reads that map. Gating here is cosmetic (show or
+// hide a control); the API enforces every write regardless.
+
+import { createContext, useContext } from "react";
+import type { Ability, AuthUser } from "./types";
+
+export const AuthContext = createContext<AuthUser | null>(null);
+
+/** The signed-in user (or null while loading). */
+export function useAuth(): AuthUser | null {
+  return useContext(AuthContext);
+}
+
+/** Whether the current user may perform `ability`. False when not loaded. */
+export function useCan(ability: Ability): boolean {
+  const user = useAuth();
+  return user?.abilities?.[ability] ?? false;
+}
+
+export function can(user: AuthUser | null, ability: Ability): boolean {
+  return user?.abilities?.[ability] ?? false;
+}

apps/web/src/lib/api.ts

@@ -34,10 +34,12 @@ import type {
   PropertyListResponse,
   PropertySort,
   PropertyStats,
+  Role,
   ServiceKind,
   Statement,
   TransactionDomain,
   TrustFilter,
+  UserRow,
 } from "./types";
 
 export const API_ORIGIN =
@@ -341,3 +343,45 @@ export function getBankFacets(): Promise<BankFacets> {
 export function getBankSummary(year?: number): Promise<BankSummary> {
   return apiFetch<BankSummary>(`/bank/summary${year ? `?year=${year}` : ""}`);
 }
+
+/* ------------------------------------------------- Users / administration */
+
+export function listUsers(): Promise<UserRow[]> {
+  return apiFetch<UserRow[]>("/users");
+}
+
+export interface CreateUserInput {
+  name: string;
+  email: string;
+  password: string;
+  role: Role;
+  active?: boolean;
+}
+
+export function createUser(input: CreateUserInput): Promise<UserRow> {
+  return apiFetch<UserRow>("/users", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export interface UpdateUserInput {
+  name?: string;
+  email?: string;
+  role?: Role;
+  active?: boolean;
+}
+
+export function updateUser(id: string, input: UpdateUserInput): Promise<UserRow> {
+  return apiFetch<UserRow>(`/users/${id}`, {
+    method: "PATCH",
+    body: JSON.stringify(input),
+  });
+}
+
+export function resetUserPassword(id: string, password: string): Promise<UserRow> {
+  return apiFetch<UserRow>(`/users/${id}/reset-password`, {
+    method: "POST",
+    body: JSON.stringify({ password }),
+  });
+}

apps/web/src/lib/labels.ts

@@ -4,11 +4,23 @@ import type {
   BankDirection,
   LedgerDirection,
   PolicyStatus,
+  Role,
   ServiceKind,
   TransactionDomain,
   TrustStatus,
 } from "./types";
 
+/** Access tiers, high → low. VIEWER is read-only; STAFF+ can write. */
+export const ROLE_LABEL: Record<Role, string> = {
+  ADMIN: "Administrador",
+  MANAGER: "Gerente",
+  STAFF: "Personal",
+  VIEWER: "Solo lectura",
+};
+
+/** Roles in descending rank — for populating role <select>s. */
+export const ROLES_DESC: Role[] = ["ADMIN", "MANAGER", "STAFF", "VIEWER"];
+
 /**
  * Placeholder the migration writes when a legacy record had no name and none
  * could be recovered from a secondary table (migration/transform_customers.py).

apps/web/src/lib/types.ts

@@ -1,12 +1,44 @@
 // TypeScript types for the Jorge Cuadros & Asociados API responses.
 // Decimals arrive as strings, dates as ISO strings.
 
+export type Role = "ADMIN" | "MANAGER" | "STAFF" | "VIEWER";
+
+export type Ability =
+  | "customer:create"
+  | "customer:update"
+  | "customer:delete"
+  | "policy:create"
+  | "policy:update"
+  | "policy:delete"
+  | "property:create"
+  | "property:update"
+  | "property:delete"
+  | "ledger:create"
+  | "ledger:void"
+  | "bank:create"
+  | "bank:void"
+  | "lookup:manage"
+  | "user:manage";
+
 export interface AuthUser {
   id: string;
   name: string;
   email: string;
-  role: string;
+  role: Role;
   active: boolean;
+  // Resolved server-side from role (abilitiesFor in the API); the UI only ever
+  // reads this map, never re-derives the rules. Server still enforces.
+  abilities: Record<Ability, boolean>;
+}
+
+export interface UserRow {
+  id: string;
+  name: string;
+  email: string;
+  role: Role;
+  active: boolean;
+  createdAt: string;
+  updatedAt: string;
 }
 
 export interface CustomerStats {

packages/database/prisma/schema.prisma

@@ -37,9 +37,14 @@ enum ServiceKind {
   OTHER
 }
 
+/// Ordered access tier (rank): ADMIN > MANAGER > STAFF > VIEWER. VIEWER is the
+/// read-only role; STAFF and above can write. Enforced by the API's ability
+/// matrix (apps/api/src/auth/abilities.ts), not by the enum itself.
 enum UserRole {
   ADMIN
+  MANAGER
   STAFF
+  VIEWER
 }
 
 // ---------------------------------------------------------------------------