UI fix + Data Export + Weekly Report + WebSocket

- Header: groups+status on one row
- GET /auth/export-data (GDPR data download)
- Weekly AI report cron (Monday 8:00)
- WebSocket /ws endpoint (real-time notifications)
- @fastify/websocket installed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/package.json

@@ -20,6 +20,7 @@
     "@fastify/rate-limit": "^10.3.0",
     "@fastify/swagger": "^9.7.0",
     "@fastify/swagger-ui": "^5.2.5",
+    "@fastify/websocket": "^11.2.0",
     "bcrypt": "^6.0.0",
     "bcryptjs": "^3.0.3",
     "dotenv": "^17.3.1",