fix(语音识别): 修复从蓝牙唤醒模式切换时编码器未关闭的问题

在 startRecognition 方法中，当上一次识别模式为 ble_wakeup 而当前模式不是 ble_wakeup 时，主动调用 BleService.shared.closeCodec() 关闭蓝牙编码器，避免资源泄漏和状态不一致。同时移除冗余的 AudioSessionHub 调用并调整代码格式。

local_plugins/agent_service/ios/agent_service/Sources/agent_service/AgentServiceImpl.swift

@@ -103,6 +103,7 @@ class AgentServiceImpl: NSObject {
     private let maxIdleSeconds: TimeInterval = 5
      var micCapture: MicrophoneCapture!
     // 语音识别模式
+    private var lastRecognitionMode: String = "normal"
     public var currentRecognitionMode: String = "normal"
    // 识别结果
     private var recognitionResult = ""
@@ -488,7 +489,7 @@ class AgentServiceImpl: NSObject {
             startIdleCheckForMode(mode: currentRecognitionMode)
         }
     }
-     func startRecognition(useBle: Bool = false, mode: String = "normal") -> Bool {
+    func startRecognition(useBle: Bool = false, mode: String = "normal") -> Bool {
         // 接收到唤醒信号，打开编码器 (设备侧)
        print("ai启动语音\(useBle))")
         var openResult = false  // 添加openResult变量定义
@@ -508,6 +509,11 @@ class AgentServiceImpl: NSObject {
                 return false
             }
         }
+        lastRecognitionMode = currentRecognitionMode
+        if (lastRecognitionMode == "ble_wakeup" && mode != "ble_wakeup"){//之前是唤醒模式，现在不是唤醒模式
+            os_log("liwei------- 关闭唤醒通道", log: logger, type: .info)
+            BleService.shared.closeCodec()
+        }
         stopRecognition()
         if isAiStreaming {
             isAiStreaming = false
@@ -529,13 +535,6 @@ class AgentServiceImpl: NSObject {
         os_log("liwei--------------- 设置语音识别模式: %{public}@", log: logger, type: .info, mode)
 
         let audioSourceType: AzureAsrHelper.AudioSourceType = useBle ? .external : .microphone
-
-        if useBle {
-           // AudioSessionHub.shared.begin(.playback)
-        } else {
-            //AudioSessionHub.shared.begin(.voice)
-        }
-        
         // 新增：标记为"启动中"，用于允许 stop 在启动未完成时也能生效
         isStartingRecognition = true
        
@@ -551,8 +550,8 @@ class AgentServiceImpl: NSObject {
             return false
         }
          if(useBle){
-                  isKeepResult = true
+            isKeepResult = true
-            }
+        }
         // 根据模式启动相应的空闲检测（此处 guard isRecognizing，会在 onSessionStarted 中再次启动）
         startIdleCheckForMode(mode: mode)