Add MQTT publish request and response models, and implement publish route

- Introduced MQTTPublishRequest and MQTTPublishResponse models for handling MQTT message publishing.
- Implemented a new POST route for publishing MQTT messages, including error handling and logging.
- Enhanced the StandaloneAutoRecorder with improved logging during manual recording start.
- Updated the frontend to include an MQTT Debug Panel for better monitoring and debugging capabilities.

vision-system-remote/src/App.tsx

@@ -8,6 +8,7 @@ import { CameraCountWidget } from './widgets/CameraCountWidget'
 import { CameraCard } from './components/CameraCard'
 import { CameraPreviewModal } from './components/CameraPreviewModal'
 import { CameraConfigModal } from './components/CameraConfigModal'
+import { MqttDebugPanel } from './components/MqttDebugPanel'
 
 // Get WebSocket URL from environment or construct it
 const getWebSocketUrl = () => {
@@ -38,6 +39,7 @@ export default function App() {
   const [previewCamera, setPreviewCamera] = useState<string | null>(null)
   const [configModalOpen, setConfigModalOpen] = useState(false)
   const [selectedCamera, setSelectedCamera] = useState<string | null>(null)
+  const [debugPanelOpen, setDebugPanelOpen] = useState(false)
 
   // WebSocket connection
   const { isConnected, subscribe } = useWebSocket(getWebSocketUrl())
@@ -513,7 +515,25 @@ export default function App() {
             setNotification({ type: 'error', message: error })
           }}
         />
-      )}
+
+      {/* MQTT Debug Panel */}
+      <MqttDebugPanel
+        isOpen={debugPanelOpen}
+        onClose={() => setDebugPanelOpen(false)}
+      />
+
+      {/* Debug Button - Bottom Right */}
+      <button
+        onClick={() => setDebugPanelOpen(true)}
+        className="fixed bottom-6 right-6 z-40 bg-purple-600 text-white px-4 py-2 rounded-lg shadow-lg hover:bg-purple-700 transition-colors flex items-center gap-2"
+        title="Open MQTT Debug Panel"
+      >
+        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
+        </svg>
+        Debug
+      </button>
     </div>
   )
 }