feat(renovaciones): send renewal notices from the list, drop manual marking

The Pólizas tab now sends. Each pending row gets an "Enviar aviso" button
backed by POST /renewals/send, which renders, mails and records the notice
through the same path the daily sweep uses — so a hand-sent letter is
marked exactly like a swept one and drops off the pending list.

Sending is now the only way a notice gets marked as sent. Remove the
manual "Marcar impreso" / "Marcar EMAIL" buttons and the endpoint behind
them (POST /policies/:id/renewal-notices, PoliciesService.markRenewalNotice,
MarkRenewalNoticeDto): they wrote a sentAt with no mail behind it, which
let the list claim a customer was notified when nothing was sent.

sendOne refuses a generation that already has a sentAt (409) so a double
click cannot mail the customer twice, and 400s when the customer has no
email on file. Sweep and single send share the new deliver() helper.

apps/api/src/renewals/renewals.controller.ts

@@ -1,17 +1,33 @@
 import {
+  Body,
   Controller,
   Get,
+  HttpCode,
   Post,
   Query,
   Req,
   UseGuards,
 } from "@nestjs/common";
 import { Request } from "express";
+import { Type } from "class-transformer";
+import { IsInt, IsString, Max, Min } from "class-validator";
 import { AbilityGuard } from "../auth/ability.guard";
 import { AuthenticatedGuard } from "../auth/authenticated.guard";
 import { RequireAbility } from "../auth/require-ability.decorator";
 import { RenewalsService } from "./renewals.service";
 
+class SendRenewalDto {
+  @IsString()
+  policyId!: string;
+
+  /** 1 = 30 días antes, 2 = 15 días antes, 3 = 7 días después. */
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(3)
+  generation!: number;
+}
+
 @UseGuards(AuthenticatedGuard, AbilityGuard)
 @Controller("renewals")
 export class RenewalsController {
@@ -29,4 +45,16 @@ export class RenewalsController {
   sweep(@Req() req: Request) {
     return this.renewals.sweep((req.user as { id: string }).id);
   }
+
+  /** Send a single pending notice from the /notificaciones list. */
+  @Post("send")
+  @RequireAbility("renewal:send")
+  @HttpCode(200)
+  send(@Body() dto: SendRenewalDto, @Req() req: Request) {
+    return this.renewals.sendOne(
+      dto.policyId,
+      dto.generation,
+      (req.user as { id: string }).id,
+    );
+  }
 }