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/policies/policies.service.ts

@@ -6,7 +6,6 @@ import { StorageService } from "../storage/storage.service";
 import { extForUpload, type UploadedFileLike } from "../storage/upload-file";
 import { toDate } from "../common/coerce";
 import { CreatePolicyDto, UpdatePolicyDto } from "./policy.dto";
-import { MarkRenewalNoticeDto } from "./renewal-notice.dto";
 import {
   BeneficiaryDto,
   ClaimDto,
@@ -359,33 +358,6 @@ export class PoliciesService {
     return this.prisma.policy.update({ where: { id }, data: { archivedAt: null } });
   }
 
-  async markRenewalNotice(
-    policyId: string,
-    dto: MarkRenewalNoticeDto,
-    sentById: string,
-  ) {
-    await this.ensurePolicy(policyId);
-    const sentAt = toDate(dto.sentAt) ?? new Date();
-    return this.prisma.renewalNotice.upsert({
-      where: {
-        policyId_generation: { policyId, generation: dto.generation },
-      },
-      create: {
-        policyId,
-        generation: dto.generation,
-        channel: dto.channel,
-        sentAt,
-        sentById,
-        notes: dto.notes,
-      },
-      update: {
-        channel: dto.channel,
-        sentAt,
-        sentById,
-        notes: dto.notes,
-      },
-    });
-  }
 
   private async ensurePolicy(id: string) {
     const found = await this.prisma.policy.findUnique({