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.

NGINX_CONFIG.md

@@ -0,0 +1,88 @@
+# Nginx Configuration for Flask-SocketIO with WebSocket Support
+
+This document provides the required Nginx configuration to properly proxy WebSocket connections for the Markov Economics application.
+
+## Required Nginx Configuration
+
+```nginx
+server {
+    listen 80;
+    server_name markov.elpatron.me;
+    
+    # Optional: Redirect HTTP to HTTPS
+    return 301 https://$server_name$request_uri;
+}
+
+server {
+    listen 443 ssl http2;
+    server_name markov.elpatron.me;
+    
+    # SSL configuration (adjust paths as needed)
+    ssl_certificate /path/to/cert.pem;
+    ssl_certificate_key /path/to/private.key;
+    
+    # WebSocket proxy settings
+    location /socket.io/ {
+        proxy_pass http://127.0.0.1:5000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # WebSocket specific timeouts
+        proxy_read_timeout 86400;
+        proxy_send_timeout 86400;
+        proxy_connect_timeout 60;
+        
+        # Disable buffering for real-time communication
+        proxy_buffering off;
+        proxy_cache off;
+    }
+    
+    # Regular HTTP traffic
+    location / {
+        proxy_pass http://127.0.0.1:5000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Standard timeouts
+        proxy_read_timeout 30;
+        proxy_send_timeout 30;
+        proxy_connect_timeout 10;
+    }
+}
+```
+
+## Critical Configuration Points
+
+1. **WebSocket Upgrade Headers**: The `Upgrade` and `Connection` headers are essential for WebSocket handshake
+2. **HTTP Version**: Must use HTTP/1.1 for WebSocket support
+3. **Extended Timeouts**: WebSocket connections need longer timeouts than regular HTTP
+4. **Disable Buffering**: Real-time communication requires immediate data flow
+5. **Separate Location Blocks**: Socket.IO traffic should be handled separately from regular HTTP traffic
+
+## Testing the Configuration
+
+After applying the configuration:
+
+1. Restart Nginx: `sudo nginx -t && sudo systemctl reload nginx`
+2. Check browser console for connection messages
+3. Test the debug endpoint: https://markov.elpatron.me/debug
+4. Run the distribution test: Open browser console and type `testDistributionChart()`
+
+## Troubleshooting
+
+If WebSocket connections still fail:
+- Check Nginx error logs: `sudo tail -f /var/log/nginx/error.log`
+- Verify the application is accessible directly: `curl http://127.0.0.1:5000/health`
+- Test WebSocket connection manually with tools like `wscat`
+- Ensure firewall allows WebSocket traffic
+
+## Alternative: Fallback to Polling Only
+
+If WebSocket cannot be made to work, the application will automatically fall back to HTTP polling, which should work with any standard HTTP proxy configuration.