Fix: Wealth Distribution Histogram behind Nginx proxy

Production Environment Fixes:
- Enhanced SocketIO configuration for proxy compatibility
- Added fallback polling mechanism when WebSocket fails
- Fixed environment configuration (FLASK_ENV vs FLASK_CONFIG)
- Added production-friendly debug logging for distribution chart
- Improved connection status monitoring and error handling

Proxy-Specific Improvements:
- Enhanced CORS and transport settings for SocketIO
- Fallback to HTTP polling when WebSocket connections fail
- Better error handling and retry mechanisms
- Debug logging that works in production mode

This should resolve the wealth distribution histogram issue
when running behind Nginx proxy in Docker containers.

app/__init__.py

@@ -5,19 +5,25 @@ Creates and configures the Flask application with SocketIO support for real-time
 updates of the Markov economics simulation.
 """
 
+import os
 from flask import Flask
 from flask_socketio import SocketIO
 from config import config
 from app.models import SimulationManager
 
-# Initialize SocketIO
-socketio = SocketIO(cors_allowed_origins="*")
+# Initialize SocketIO with enhanced proxy support
+socketio = SocketIO(
+    cors_allowed_origins="*",
+    async_mode='threading',
+    logger=True,
+    engineio_logger=True
+)
 
 # Global simulation manager instance
 simulation_manager = SimulationManager()
 
 
-def create_app(config_name='development'):
+def create_app(config_name=None):
     """
     Create and configure the Flask application.
     
@@ -27,11 +33,20 @@ def create_app(config_name='development'):
     Returns:
         Configured Flask application instance
     """
+    if config_name is None:
+        config_name = os.getenv('FLASK_CONFIG', os.getenv('FLASK_ENV', 'development'))
+        
     app = Flask(__name__)
     app.config.from_object(config[config_name])
     
-    # Initialize extensions
-    socketio.init_app(app, async_mode='threading')
+    # Initialize extensions with proxy-friendly settings
+    socketio.init_app(
+        app, 
+        async_mode='threading',
+        cors_allowed_origins="*",
+        allow_upgrades=True,
+        transports=['websocket', 'polling']
+    )
     
     # Register blueprints
     from .routes.main import main_bp