Phase 2a: Prisma schema + shared schemas for v1.0 features

- New models: Attachment, Webhook, Notification, SavedView
- New fields: User.notificationPrefs (Json), indexes on Ticket
- post-push.sql manages the tsvector columns + GIN indexes + triggers for
  FTS on Ticket (title/overview/displayId) and Comment (body); Prisma can't
  express these
- package.json scripts: db:push and start:prod now chain `prisma db execute`
  against post-push.sql after `prisma db push`
- db:migrate script removed — project uses push workflow, not migrations
- Shared Zod schemas: attachment (25MB limit + mimetype allowlist), savedView,
  notification (prefs, mark-read, webhook CRUD)
- Shared type additions: Attachment, Notification, SavedView, Webhook,
  PaginatedResponse<T>
- Test fixtures updated for the new User.notificationPrefs column

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/src/services/authService.test.ts

@@ -16,6 +16,7 @@ describe('authService.login', () => {
       passwordHash: await bcrypt.hash(password, 4),
       role: 'AGENT',
       apiKey: null,
+      notificationPrefs: null,
       createdAt: new Date(),
       updatedAt: new Date(),
     });
@@ -35,6 +36,7 @@ describe('authService.login', () => {
       passwordHash: await bcrypt.hash('correct', 4),
       role: 'AGENT',
       apiKey: null,
+      notificationPrefs: null,
       createdAt: new Date(),
       updatedAt: new Date(),
     });
@@ -59,6 +61,7 @@ describe('authService.login', () => {
       passwordHash: await bcrypt.hash(password, 4),
       role: 'SERVICE',
       apiKey: 'sk_xyz',
+      notificationPrefs: null,
       createdAt: new Date(),
       updatedAt: new Date(),
     });

server/src/services/userService.test.ts

@@ -11,6 +11,7 @@ const stubUser = {
   role: 'AGENT' as const,
   passwordHash: '',
   apiKey: null,
+  notificationPrefs: null,
   createdAt: new Date(),
   updatedAt: new Date(),
 };