Backend: Customer module (list/search/detail) + working session auth + pnpm

Adds the unified Customer API against the migrated data:
- customers.service: list (search across name/email/phone/city/legacy id,
  business-line filter, pagination + per-row _count flags), detail (identity +
  legacyRefs + properties/services/trust + policies with installments/vehicles/
  drivers/beneficiaries/claims/docs + recent transactions + a per-domain/
  currency ledger summary), and stats.
- customers.controller: GET /customers, /customers/:id, /customers/stats,
  guarded by AuthenticatedGuard. Registered in AppModule.
- Fix LocalAuthGuard to call super.logIn so a session is actually established
  (login previously succeeded but persisted no session -> 403 afterwards).
- apps/api/scripts/seed-user.mjs: idempotent Argon2 admin seed.

Tooling: adopt pnpm as the package manager (machine npm is a pnpm shim that
ignores the workspaces field). Add pnpm-workspace.yaml (+ onlyBuiltDependencies
for argon2/prisma/nest native builds), switch the api's @jorgecuadros/database
dep to workspace:*, add @types/passport, track pnpm-lock.yaml, drop the stale
package-lock.json.

Verified end-to-end against the dev DB: login sets a session cookie; stats
returns 1682 customers / 526 both-lines / 45861 transactions; search + detail
return the full cross-line customer view (properties+services AND policies AND
a unified transaction statement).

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

apps/api/src/app.module.ts

@@ -3,6 +3,7 @@ import { ConfigModule } from "@nestjs/config";
 import { PrismaModule } from "./prisma/prisma.module";
 import { UsersModule } from "./users/users.module";
 import { AuthModule } from "./auth/auth.module";
+import { CustomersModule } from "./customers/customers.module";
 import { AppController } from "./app.controller";
 
 @Module({
@@ -11,6 +12,7 @@ import { AppController } from "./app.controller";
     PrismaModule,
     UsersModule,
     AuthModule,
+    CustomersModule,
   ],
   controllers: [AppController],
 })