fix: Resolve IPv4/IPv6 connection issues in News Engine Console

- Backend: Downgrade Pydantic from v2 to v1.10.13 for compatibility
- Backend: Fix ObjectId to string conversion in user service
- Backend: Update config to use pydantic BaseSettings (v1 import)
- Frontend: Downgrade ESLint packages for compatibility
- Frontend: Configure Vite proxy to use 127.0.0.1 instead of localhost
- Frontend: Set API client to use direct backend URL (127.0.0.1:8101)
- Frontend: Add package-lock.json for dependency locking

This resolves MongoDB connection issues and frontend-backend
communication problems caused by localhost resolving to IPv6.
Verified: Login and dashboard functionality working correctly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

services/news-engine-console/frontend/package.json

@@ -27,10 +27,10 @@
   "devDependencies": {
     "@types/react": "^18.3.10",
     "@types/react-dom": "^18.3.0",
-    "@typescript-eslint/eslint-plugin": "^8.8.0",
-    "@typescript-eslint/parser": "^8.8.0",
+    "@typescript-eslint/eslint-plugin": "^7.18.0",
+    "@typescript-eslint/parser": "^7.18.0",
     "@vitejs/plugin-react": "^4.3.2",
-    "eslint": "^9.11.1",
+    "eslint": "^8.57.1",
     "eslint-plugin-react-hooks": "^4.6.2",
     "eslint-plugin-react-refresh": "^0.4.12",
     "typescript": "^5.6.2",