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/package.json

@@ -5,9 +5,8 @@
     "dev": "tsx watch src/index.ts",
     "build": "tsc",
     "start": "node dist/server/src/index.js",
-    "start:prod": "prisma db push && node dist/server/src/index.js",
-    "db:migrate": "prisma migrate dev",
-    "db:push": "prisma db push",
+    "start:prod": "prisma db push && prisma db execute --file prisma/post-push.sql --schema prisma/schema.prisma && node dist/server/src/index.js",
+    "db:push": "prisma db push && prisma db execute --file prisma/post-push.sql --schema prisma/schema.prisma",
     "db:generate": "prisma generate",
     "db:seed": "tsx prisma/seed.ts",
     "typecheck": "tsc --noEmit",
@@ -23,7 +22,9 @@
     "express-async-errors": "^3.1.0",
     "express-rate-limit": "^7.5.0",
     "jsonwebtoken": "^9.0.2",
+    "multer": "^2.1.1",
     "node-cron": "^3.0.3",
+    "nodemailer": "^8.0.5",
     "pino": "^9.5.0",
     "pino-http": "^10.3.0",
     "pino-pretty": "^13.0.0",
@@ -34,8 +35,10 @@
     "@types/cors": "^2.8.17",
     "@types/express": "^4.17.21",
     "@types/jsonwebtoken": "^9.0.7",
+    "@types/multer": "^2.1.0",
     "@types/node": "^22.10.0",
     "@types/node-cron": "^3.0.11",
+    "@types/nodemailer": "^8.0.0",
     "@types/supertest": "^6.0.2",
     "prisma": "^5.22.0",
     "supertest": "^7.0.0",