feat(reports): parameterized renewal-notice report + legacy report reference

Replaces ~40 legacy Access renewal-notice report clones (one per carrier
per coverage tier, e.g. AMPL/RC/LIC RENEW X MES/VENCE ATLAS 13/2013) with
one parameterized aviso-renovacion report driven by real Policy/Vehicle/
coveragesJson data instead of hand-typed label text per clone.

- schema.prisma: add RenewalNotice, replacing the legacy CONTROL <ramo>
  RENEW[2/3] X MES paper log of which notice generation was sent
- reports: new "letter" ReportFormat + aviso-renovacion registry entry +
  LetterLayout renderer in ReportRunner.tsx
- docs/RENEWAL_NOTICES.md + migration/legacy_report_defs/: extracted (via
  Application.SaveAsText, since the VBA project wouldn't load) and
  documented the legacy report/query chain this replaces

Coveragesjson key names and a mark-as-sent mutation are still unverified/
unbuilt — see caveats in docs/RENEWAL_NOTICES.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/database/prisma/schema.prisma

@@ -181,12 +181,42 @@ model Policy {
   claims         Claim[]
   documents      PolicyDocument[]
   properties     Property[]
+  renewalNotices RenewalNotice[]
 
   @@unique([legacySourceDb, legacySourceTable, legacyId])
   @@index([policyNumber])
   @@map("policies")
 }
 
+enum RenewalNoticeChannel {
+  MAIL
+  EMAIL
+}
+
+/// Replaces the legacy `CONTROL <ramo> RENEW[2/3] X MES` reports — a
+/// per-batch printed checklist of who'd been sent which reminder. One row
+/// per notice generation actually sent for a policy, so "who got a 1st/2nd/
+/// 3rd notice and when" is a query instead of a paper trail. See
+/// docs/RENEWAL_NOTICES.md for the legacy report chain this replaces.
+model RenewalNotice {
+  id         String               @id @default(uuid())
+  policyId   String
+  policy     Policy               @relation(fields: [policyId], references: [id])
+  // 1 = first notice (bare RENEW), 2 = RENEW2, 3 = RENEW3 in the legacy naming.
+  generation Int
+  channel    RenewalNoticeChannel @default(MAIL)
+  sentAt     DateTime?
+  sentById   String?
+  notes      String?              @db.Text
+  createdAt  DateTime             @default(now())
+
+  // One row per generation per policy — matches the legacy's 1st/2nd/3rd
+  // notice cadence; re-running the same generation for a policy updates it
+  // rather than duplicating a log entry.
+  @@unique([policyId, generation])
+  @@map("renewal_notices")
+}
+
 /// Unpivots the 4 hardcoded payment-installment columns found on every
 /// legacy policy table (1ER PAGO/FECHA PAGO/NO CHEQUE, ...2, ...3, ...4).
 model PolicyPaymentInstallment {