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/prisma/post-push.sql

@@ -0,0 +1,52 @@
+-- Idempotent SQL applied after `prisma db push`.
+-- Adds Postgres full-text-search columns + triggers + GIN indexes for Ticket and Comment.
+-- Prisma can't express tsvector/triggers, so we manage them here.
+
+-- Ticket.searchVector
+ALTER TABLE "Ticket" ADD COLUMN IF NOT EXISTS "searchVector" tsvector;
+
+CREATE INDEX IF NOT EXISTS ticket_search_idx ON "Ticket" USING GIN ("searchVector");
+
+CREATE OR REPLACE FUNCTION ticket_search_trigger() RETURNS trigger AS $$
+BEGIN
+  NEW."searchVector" :=
+    setweight(to_tsvector('english', coalesce(NEW."displayId", '')), 'A') ||
+    setweight(to_tsvector('english', coalesce(NEW."title", '')), 'A') ||
+    setweight(to_tsvector('english', coalesce(NEW."overview", '')), 'B');
+  RETURN NEW;
+END
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS ticket_search_update ON "Ticket";
+CREATE TRIGGER ticket_search_update
+  BEFORE INSERT OR UPDATE OF "title", "overview", "displayId" ON "Ticket"
+  FOR EACH ROW EXECUTE FUNCTION ticket_search_trigger();
+
+-- Backfill any rows missing the vector (first run or new columns)
+UPDATE "Ticket"
+SET "searchVector" =
+  setweight(to_tsvector('english', coalesce("displayId", '')), 'A') ||
+  setweight(to_tsvector('english', coalesce("title", '')), 'A') ||
+  setweight(to_tsvector('english', coalesce("overview", '')), 'B')
+WHERE "searchVector" IS NULL;
+
+-- Comment.searchVector
+ALTER TABLE "Comment" ADD COLUMN IF NOT EXISTS "searchVector" tsvector;
+
+CREATE INDEX IF NOT EXISTS comment_search_idx ON "Comment" USING GIN ("searchVector");
+
+CREATE OR REPLACE FUNCTION comment_search_trigger() RETURNS trigger AS $$
+BEGIN
+  NEW."searchVector" := to_tsvector('english', coalesce(NEW."body", ''));
+  RETURN NEW;
+END
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS comment_search_update ON "Comment";
+CREATE TRIGGER comment_search_update
+  BEFORE INSERT OR UPDATE OF "body" ON "Comment"
+  FOR EACH ROW EXECUTE FUNCTION comment_search_trigger();
+
+UPDATE "Comment"
+SET "searchVector" = to_tsvector('english', coalesce("body", ''))
+WHERE "searchVector" IS NULL;