Enhanced: Comprehensive production debugging and Nginx proxy support

Debugging Tools:
- Added /debug endpoint to verify deployment and test distribution functionality
- Added browser console test function: testDistributionChart()
- Enhanced SocketIO settings with better transport priorities
- Added comprehensive error tracking and status reporting

Nginx Configuration:
- Created NGINX_CONFIG.md with complete proxy setup guide
- Improved WebSocket transport settings and timeouts
- Better ping/pong settings for connection stability

Production Compatibility:
- Optimized SocketIO for proxy environments
- Enhanced fallback mechanisms
- Production-ready logging and error handling

This should resolve proxy-related issues and provide clear diagnostic tools.

app/__init__.py

@@ -15,8 +15,13 @@ from app.models import SimulationManager
 socketio = SocketIO(
     cors_allowed_origins="*",
     async_mode='threading',
-    logger=True,
-    engineio_logger=True
+    logger=False,  # Disable to avoid log spam in production
+    engineio_logger=False,
+    # Transport order: try websocket first, then polling
+    transports=['websocket', 'polling'],
+    # Ping settings for better connection detection
+    ping_timeout=60,
+    ping_interval=25
 )
 
 # Global simulation manager instance
@@ -45,7 +50,9 @@ def create_app(config_name=None):
         async_mode='threading',
         cors_allowed_origins="*",
         allow_upgrades=True,
-        transports=['websocket', 'polling']
+        transports=['websocket', 'polling'],
+        ping_timeout=60,
+        ping_interval=25
     )
     
     # Register blueprints