feat(asr): 添加语音识别超时机制

- 添加 30 秒监听超时常量配置
- 实现监听超时后的自动停止功能
- 添加超时回调和日志记录机制
- 在开始录音时启动超时计时器
- 在部分结果返回时重置超时时间
- 在停止录音时取消超时任务

app/src/main/java/com/nova/brain/glass/helper/AsrHelper.kt

@@ -56,10 +56,18 @@ object AsrHelper : OfflineCmdListener {
     private var isTtsConnected = false
 
     private const val WAKE_RESPONSE = "在呢，您请说"
+    private const val LISTENING_TIMEOUT_MS = 30_000L
 
     private val mainHandler = Handler(Looper.getMainLooper())
     private var listeningDialog: AlertDialog? = null
     private var noNetworkDialog: AlertDialog? = null
+    private val listeningTimeoutRunnable = Runnable {
+        if (!isMicRunning) return@Runnable
+        runCatching { asr?.stopAsrWithMic() }
+        isMicRunning = false
+        dismissListeningDialog()
+        Log.d(TAG, "ASR listening timeout after ${LISTENING_TIMEOUT_MS}ms")
+    }
     private val networkCheckRunnable = object : Runnable {
         override fun run() {
             if (isNetworkAvailable()) {
@@ -141,6 +149,7 @@ object AsrHelper : OfflineCmdListener {
             Log.w(TAG, "ASR startMic ignored: mic already running")
             return
         }
+        restartListeningTimeout()
         runCatching { asr?.startAsrWithMic() }
             .onSuccess {
                 isMicRunning = true
@@ -149,6 +158,15 @@ object AsrHelper : OfflineCmdListener {
             .onFailure { Log.e(TAG, "ASR startAsrWithMic failed: ${it.message}") }
     }
 
+    private fun restartListeningTimeout() {
+        mainHandler.removeCallbacks(listeningTimeoutRunnable)
+        mainHandler.postDelayed(listeningTimeoutRunnable, LISTENING_TIMEOUT_MS)
+    }
+
+    private fun cancelListeningTimeout() {
+        mainHandler.removeCallbacks(listeningTimeoutRunnable)
+    }
+
     private fun showListeningDialog() {
         mainHandler.post {
             listeningDialog?.dismiss()
@@ -185,6 +203,7 @@ object AsrHelper : OfflineCmdListener {
             listeningDialog?.dismiss()
             listeningDialog = null
         }
+        cancelListeningTimeout()
     }
 
     private fun showNoNetworkDialog() {
@@ -247,12 +266,14 @@ object AsrHelper : OfflineCmdListener {
 
             override fun onStart(taskId: String) {
                 currentPartial = ""
+                restartListeningTimeout()
                 Log.d(TAG, "ASR started: $taskId")
             }
 
             override fun onPartialResult(taskId: String, text: String) {
                 // 滚动更新当前识别中间结果
                 currentPartial += text
+                restartListeningTimeout()
                 Log.d(TAG, "ASR partial: $text")
             }