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/backend/requirements.txt

@@ -1,8 +1,8 @@
 fastapi==0.104.1
 uvicorn[standard]==0.24.0
 motor==3.3.2
-pydantic==2.5.0
-pydantic-settings==2.1.0
+pydantic==1.10.13
+pydantic[email]==1.10.13
 python-jose[cryptography]==3.3.0
 passlib[bcrypt]==1.7.4
 python-multipart==0.0.6