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/routes/main.py

@@ -101,6 +101,59 @@ def results(simulation_id):
                          title=f"Results - Simulation {simulation_id[:8]}")
 
 
+@main_bp.route('/debug')
+def debug_info():
+    """
+    Debug endpoint to verify deployment and test functionality.
+    
+    Returns:
+        JSON response with debug information
+    """
+    import os
+    from datetime import datetime
+    from app.models.economic_model import EconomicSimulation, SimulationParameters
+    
+    # Test distribution functionality
+    test_params = SimulationParameters(
+        r_rate=0.05,
+        g_rate=0.03,
+        initial_capital=1000,
+        initial_consumption=1000,
+        num_agents=10,
+        iterations=5
+    )
+    
+    test_sim = EconomicSimulation(test_params)
+    # Run a few steps
+    for _ in range(5):
+        test_sim.step()
+    
+    # Get distribution data
+    labels, counts = test_sim.get_wealth_histogram(5)
+    
+    debug_data = {
+        'timestamp': datetime.now().isoformat(),
+        'environment': os.getenv('FLASK_ENV', 'unknown'),
+        'config': os.getenv('FLASK_CONFIG', 'unknown'),
+        'python_version': os.sys.version,
+        'distribution_test': {
+            'labels': labels,
+            'counts': counts,
+            'total_agents': len(test_sim.agents),
+            'snapshots': len(test_sim.snapshots)
+        },
+        'fixes_deployed': {
+            'fallback_polling': True,
+            'enhanced_socketio': True,
+            'production_debug': True,
+            'environment_fix': True
+        },
+        'version_info': 'v2.1-proxy-fixes'
+    }
+    
+    return jsonify(debug_data)
+
+
 @main_bp.route('/health')
 def health_check():
     """