🌍 Multi-Country Map Tile CDN + AI Chat + Trail API + AUTH

🔐 Auth (POST):
  POST /api/auth/signup
  POST /api/auth/login
  GET /api/auth/verify

🤖 AI Chat (POST):
  POST / with JSON: { "message": "your question" }

🥾 Trail API (GET):
  GET /api/trails/popular?country=Sweden
  GET /api/trails/list?user_id=1
  POST /api/trails/upload
  GET /api/trails/my-uploads
  DELETE /api/trails/:id

🗺️ Map Tile Proxy (GET) - 11 Countries
Features: ⚡ 300+ global edge locations, 📦 30-day caching, 🚀 10-20x faster loading