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>

shared/types.ts

@@ -74,5 +74,55 @@ export interface Ticket {
   assignee: UserSummary | null;
   createdBy: UserSummary;
   comments?: Comment[];
-  _count?: { comments: number };
+  _count?: { comments: number; attachments?: number };
+}
+
+export interface Attachment {
+  id: string;
+  filename: string;
+  mimetype: string;
+  size: number;
+  ticketId: string | null;
+  commentId: string | null;
+  uploadedById: string;
+  uploadedBy: UserSummary;
+  createdAt: string;
+}
+
+export interface Notification {
+  id: string;
+  userId: string;
+  kind: string;
+  ticketId: string | null;
+  commentId: string | null;
+  data: unknown;
+  readAt: string | null;
+  createdAt: string;
+}
+
+export interface SavedView {
+  id: string;
+  userId: string;
+  name: string;
+  filters: Record<string, unknown>;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface Webhook {
+  id: string;
+  name: string;
+  url: string;
+  events: string[];
+  secret?: string;
+  active: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface PaginatedResponse<T> {
+  data: T[];
+  total: number;
+  page: number;
+  pageSize: number;
 }