feat(documents): Phase A schema + service skeletons

Adds Phase A data model deltas to documents/templates and the new
document_watchers table. Introduces createFromWizard/createFromUpload
stubs, getDocumentDetail aggregator, cancelDocument flow, signed-doc
email composer, reservation agreement context, and notifyDocumentEvent
fan-out. Validator update accepts new template formats with html-only
bodyHtml requirement. EOI cadence backfilled to 1 day to preserve
current effective behaviour.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/db/schema/relations.ts

@@ -52,6 +52,7 @@ import {
   documentSigners,
   documentEvents,
   documentTemplates,
+  documentWatchers,
   formTemplates,
   formSubmissions,
 } from './documents';
@@ -457,7 +458,7 @@ export const berthTagsRelations = relations(berthTags, ({ one }) => ({
 
 // ─── Berth Reservations ───────────────────────────────────────────────────────
 
-export const berthReservationsRelations = relations(berthReservations, ({ one }) => ({
+export const berthReservationsRelations = relations(berthReservations, ({ one, many }) => ({
   berth: one(berths, {
     fields: [berthReservations.berthId],
     references: [berths.id],
@@ -482,6 +483,7 @@ export const berthReservationsRelations = relations(berthReservations, ({ one })
     fields: [berthReservations.contractFileId],
     references: [files.id],
   }),
+  documents: many(documents),
 }));
 
 // ─── Documents ────────────────────────────────────────────────────────────────
@@ -538,8 +540,13 @@ export const documentsRelations = relations(documents, ({ one, many }) => ({
     fields: [documents.companyId],
     references: [companies.id],
   }),
+  reservation: one(berthReservations, {
+    fields: [documents.reservationId],
+    references: [berthReservations.id],
+  }),
   signers: many(documentSigners),
   events: many(documentEvents),
+  watchers: many(documentWatchers),
 }));
 
 export const documentSignersRelations = relations(documentSigners, ({ one, many }) => ({
@@ -566,6 +573,17 @@ export const documentTemplatesRelations = relations(documentTemplates, ({ one })
     fields: [documentTemplates.portId],
     references: [ports.id],
   }),
+  sourceFile: one(files, {
+    fields: [documentTemplates.sourceFileId],
+    references: [files.id],
+  }),
+}));
+
+export const documentWatchersRelations = relations(documentWatchers, ({ one }) => ({
+  document: one(documents, {
+    fields: [documentWatchers.documentId],
+    references: [documents.id],
+  }),
 }));
 
 export const formTemplatesRelations = relations(formTemplates, ({ one, many }) => ({