Ship Novya PWA with backend for deployable production use.

Fix production TypeScript builds and add DEPLOY.md so the app can be hosted from this repo.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/modules/chat/index.ts

@@ -0,0 +1,8 @@
+export { createChatRoutes } from './chat.routes.js';
+export {
+  createChatSession,
+  listChatMessages,
+  listChatSessions,
+  sendChatMessage,
+  startChatSession,
+} from './chat.service.js';