fix(通知): 优化BLE媒体服务的通知配置

修复通知渠道重复创建的问题并完善通知设置
使用应用图标作为通知图标
添加通知的持续显示和静默设置

local_plugins/agent_service/android/src/main/kotlin/com/yunqiinnovation/agent_service/BleMediaService.kt

@@ -850,13 +850,21 @@ private var companionManager: BleCompanionManager? = null
 
         // Android 8.0+ 需要创建通知渠道
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val existingChannel = manager.getNotificationChannel(CHANNEL_ID)
+            if (existingChannel == null) {
                 val channel = NotificationChannel(
                     CHANNEL_ID,
-                "语音助手代理服务",
+                    "Voice assistant agent",
                     NotificationManager.IMPORTANCE_LOW
                 )
+                channel.description = "Voice assistant agent"
+                channel.setShowBadge(false)
+                channel.enableLights(false)
+                channel.enableVibration(false)
+                channel.lockscreenVisibility = Notification.VISIBILITY_PRIVATE
                 manager.createNotificationChannel(channel)
             }
+        }
 
         // 点击通知打开主界面
         val intent = packageManager.getLaunchIntentForPackage(packageName)?.apply {
@@ -873,11 +881,18 @@ private var companionManager: BleCompanionManager? = null
             null
         }
 
+        val appIconResId = applicationInfo.icon.takeIf { it != 0 } ?: android.R.drawable.ic_dialog_info
+
         // 构建通知
         val builder = NotificationCompat.Builder(this, CHANNEL_ID)
             .setContentTitle("Voitrans")
-            .setContentText("语音助手代理服务运行中")
+            .setContentText("Voice assistant agent is running")
-            .setSmallIcon(android.R.drawable.ic_dialog_info)
+            .setSmallIcon(appIconResId)
+            .setOngoing(true)
+            .setOnlyAlertOnce(true)
+            .setCategory(NotificationCompat.CATEGORY_SERVICE)
+            .setPriority(NotificationCompat.PRIORITY_LOW)
+            .setShowWhen(false)
             
         // 设置点击意图
         pendingIntent?.let { builder.setContentIntent(it) }