Add Caddy server configuration for domain markov.elpatron.me with Let's Encrypt SSL and WebSocket support. Includes: - Caddy service in docker-compose.yml - Caddyfile with SSL and WebSocket configuration - Enhanced Flask app for proxy compatibility - Documentation files (CADDY.md, updated README.md)

Caddyfile

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+markov.elpatron.me {
+    # Use Let's Encrypt for SSL certificates
+    elpatron@mailbox.org
+    
+    # Proxy all requests to the Flask application
+    reverse_proxy markov-economics:5000 {
+        # WebSocket support
+        header_up Upgrade {header.Upgrade}
+        header_up Connection {header.Connection}
+        header_up Host {host}
+        header_up X-Real-IP {remote_host}
+        header_up X-Forwarded-For {remote_host}
+        header_up X-Forwarded-Proto {scheme}
+    }
+    
+    # Handle WebSocket upgrade requests specifically
+    @websockets {
+        header Connection *Upgrade*
+        header Upgrade websocket
+    }
+    
+    reverse_proxy @websockets markov-economics:5000 {
+        # Ensure WebSocket headers are properly forwarded
+        header_up Upgrade {header.Upgrade}
+        header_up Connection {header.Connection}
+        header_up Host {host}
+        header_up X-Real-IP {remote_host}
+        header_up X-Forwarded-For {remote_host}
+        header_up X-Forwarded-Proto {scheme}
+    }
+}