Add flexible Flask port configuration via environment variable

- Add FLASK_PORT environment variable support in docker-compose.yml
- Update Flask app to read port from FLASK_PORT environment variable
- Add FLASK_PORT configuration to .env and .env.example files
- Enables running Flask on custom ports to avoid port conflicts in containerized environments

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env

@@ -1,4 +1,5 @@
 # WOL Manager Environment Configuration
 WOL_NETWORK_MODE=bridge
 WOL_EXTERNAL_PORT=5000
+FLASK_PORT=5000
 FLASK_DEBUG=true

.env.example

@@ -10,6 +10,9 @@ WOL_NETWORK_MODE=bridge
 # For Linux with host mode: this setting is ignored
 WOL_EXTERNAL_PORT=5000
 
+# Flask internal port (port on which Flask app runs inside container)
+FLASK_PORT=5000
+
 # Examples:
 # Windows Docker Desktop:
 # WOL_NETWORK_MODE=bridge

app/app.py

@@ -485,5 +485,7 @@ def trigger_windows_scan():
         })
 
 if __name__ == '__main__':
+    # Get port from environment variable or default to 5000
+    port = int(os.environ.get('FLASK_PORT', 5000))
     # Enable debug mode for development with hot reload
-    app.run(host='0.0.0.0', port=5000, debug=True, use_reloader=True)
+    app.run(host='0.0.0.0', port=port, debug=True, use_reloader=True)

docker-compose.yml

@@ -15,6 +15,7 @@ services:
       - PYTHONUNBUFFERED=1
       - WSL_INTEROP=${WSL_INTEROP}
       - FLASK_DEBUG=${FLASK_DEBUG:-false}
+      - FLASK_PORT=${FLASK_PORT:-5000}
     network_mode: "${WOL_NETWORK_MODE:-bridge}"
     privileged: true
     cap_add: