fix: 移除服务端黑帧自动切换无障碍截图模式逻辑

- 连续黑帧不再发送captureMode:accessibility指令给安卓端
- 黑帧计数仅用于日志统计，不触发模式切换
- 避免服务端误判导致安卓端回退到低帧率无障碍截图

src/index.ts

@@ -1786,17 +1786,14 @@ class RemoteControlServer {
       }, 5000) // 5s grace period for reconnect
 
     } else if (socket.clientType === 'web' && socket.clientId) {
-      // 🔧 优化Web客户端断开处理
       const clientId = socket.clientId
       const client = this.webClientManager.getClient(clientId)
 
       if (client) {
-        // 如果客户端正在控制设备，释放控制权
         if (client.controllingDeviceId) {
-          this.logger.info(`🔓 Web客户端断开，释放设备控制权: ${client.controllingDeviceId}`)
+          this.logger.info(`[Disconnect] Web client disconnected, releasing device control: ${client.controllingDeviceId}`)
           this.webClientManager.releaseDeviceControl(client.controllingDeviceId)
 
-          // 通知设备控制者已离开
           const deviceSocketId = this.deviceManager.getDeviceSocketId(client.controllingDeviceId)
           if (deviceSocketId) {
             const deviceSocket = this.io.sockets.sockets.get(deviceSocketId)
@@ -1807,19 +1804,15 @@ class RemoteControlServer {
         }
 
         this.webClientManager.removeClient(clientId)
-        this.logger.info(`Web客户端断开连接: ${clientId} (IP: ${client.ip})`)
+        this.logger.info(`[Disconnect] Web client removed: ${clientId} (IP: ${client.ip})`)
       } else {
-        // 通过Socket ID移除客户端
         this.webClientManager.removeClientBySocketId(socket.id)
-        this.logger.info(`Web客户端断开连接 (通过Socket ID): ${socket.id}`)
+        this.logger.info(`[Disconnect] Web client removed by socketId: ${socket.id}`)
       }
 
-      this.logger.info(`📊 当前Web客户端数量: ${this.webClientManager.getClientCount()}`)
+      this.logger.info(`[Disconnect] Web client count: ${this.webClientManager.getClientCount()}`)
     } else {
-      // 🔧 处理未识别的连接类型
-      this.logger.warn(`⚠️ 未识别的连接断开: ${socket.id} (类型: ${socket.clientType})`)
-
-      // 尝试清理可能存在的记录
+      this.logger.warn(`[Disconnect] Unknown client type: ${socket.id} (type: ${socket.clientType})`)
       this.webClientManager.removeClientBySocketId(socket.id)
     }
   }

src/services/MessageRouter.ts

@@ -546,52 +546,21 @@ export class MessageRouter {
       if (dataSize > 0 && dataSize < MIN_VALID_FRAME_SIZE) {
         this.droppedFrames++
         
-        // ✅ 追踪连续黑帧数
+        // 追踪连续黑帧数（仅记录日志，不触发模式切换）
         const deviceId = screenData.deviceId
         const count = (this.consecutiveBlackFrames.get(deviceId) || 0) + 1
         this.consecutiveBlackFrames.set(deviceId, count)
         
-        if (this.routedFrames % 100 === 0) {
-          this.logger.warn(`⚠️ 过滤黑屏帧: ${dataSize} 字符 < ${MIN_VALID_FRAME_SIZE}, 设备${deviceId}, 连续黑帧${count}, 已丢弃${this.droppedFrames}帧`)
-        }
-        
-        // ✅ 连续50个黑帧后，通知Android端切换到无障碍截图模式
-        if (count >= 50 && !this.captureModeSwitchSent.has(deviceId)) {
-          this.captureModeSwitchSent.add(deviceId)
-          this.logger.warn(`🔄 设备${deviceId}连续${count}个黑帧，发送切换到无障碍截图模式指令`)
-          
-          try {
-            const deviceSocketId = this.deviceManager.getDeviceSocketId(deviceId)
-            if (deviceSocketId) {
-              const deviceSocket = this.webClientManager.io?.sockets.sockets.get(deviceSocketId)
-              if (deviceSocket) {
-                deviceSocket.emit('quality_adjust', {
-                  captureMode: 'accessibility',
-                  fps: 10,
-                  quality: 50,
-                  maxWidth: 480,
-                  maxHeight: 854
-                })
-                this.logger.info(`📤 已向设备${deviceId}发送切换采集模式指令`)
-              }
-            }
-          } catch (e) {
-            this.logger.error(`❌ 发送切换采集模式指令失败:`, e)
-          }
+        if (count % 100 === 1) {
+          this.logger.warn(`过滤黑屏帧: ${dataSize} 字符 < ${MIN_VALID_FRAME_SIZE}, 设备${deviceId}, 连续黑帧${count}, 已丢弃${this.droppedFrames}帧`)
         }
         
         return false
       }
       
-      // ✅ 收到有效帧，重置黑帧计数
+      // 收到有效帧，重置黑帧计数
       if (screenData.deviceId) {
-        const prevCount = this.consecutiveBlackFrames.get(screenData.deviceId) || 0
-        if (prevCount > 0) {
-          this.logger.info(`✅ 设备${screenData.deviceId}收到有效帧(${dataSize}字符)，重置黑帧计数(之前${prevCount})`)
-        }
         this.consecutiveBlackFrames.set(screenData.deviceId, 0)
-        // 收到有效帧后允许再次发送切换指令（如果后续又出现黑帧）
-        this.captureModeSwitchSent.delete(screenData.deviceId)
       }
 
       // 🔧 检查设备是否有控制者，没有控制者直接丢弃（提前检查，减少处理开销）