Feat: Hybrid Architecture Phase 1

- Implemented Game Server (game-server.js) with Socket.io
- Added JSON Schemas for Campaigns and Missions
- Updated Docker configurations for multi-service setup
- Refactored main.js to allow local network connections
- Removed legacy code (main_old.js)
- Updated dependencies

package.json

@@ -12,6 +12,9 @@
         "vite": "^5.0.0"
     },
     "dependencies": {
+        "express": "^5.2.1",
+        "socket.io": "^4.8.3",
+        "socket.io-client": "^4.8.3",
         "three": "^0.160.0"
     }
-}
+}