radio/android: PTT FGS microphone permission + детект потери микрофона

- FOREGROUND_SERVICE_MICROPHONE запрос + foregroundServiceType microphone|specialUse (Android 14+)
- RadioOverlayService.start: не стартовать без mic-разрешения, ServiceCompat.startForeground с TYPE_MICROPHONE
- RadioAudioEngine: micDead-флаг и лог при обрыве captureLoop/read
- radio.c: лог первого кадра burst на транзитных узлах
- SettingsScreen: категория radio в списке debug-категорий

tools/chatgui-android/app/src/main/java/com/utun/chat/MainActivity.kt

@@ -49,6 +49,7 @@ class MainActivity : ComponentActivity() {
         super.onCreate(savedInstanceState)
 
         requestNotificationPermission()
+        requestFgsMicPermission()
         handleIncomingCallIntent(intent)
 
         /* Edge-to-edge with dark status/navigation bar icons (light app theme) */
@@ -398,6 +399,14 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    private fun requestFgsMicPermission() {
+        if (Build.VERSION.SDK_INT >= 34 &&
+            ContextCompat.checkSelfPermission(this, Manifest.permission.FOREGROUND_SERVICE_MICROPHONE) !=
+            PackageManager.PERMISSION_GRANTED) {
+            requestPermissions(arrayOf(Manifest.permission.FOREGROUND_SERVICE_MICROPHONE), 2)
+        }
+    }
+
     override fun onStop() {
         super.onStop()
         if (NativeLib.isReady()) NativeLib.setActive(false)

tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioAudioEngine.kt

@@ -45,6 +45,7 @@ class RadioAudioEngine {
     @Volatile private var active = false
     @Volatile private var groupId = 0L
     @Volatile private var talking = false
+    @Volatile private var micDead = false
 
     private val _talkingFlow = MutableStateFlow(false)
     val talkingFlow: StateFlow<Boolean> = _talkingFlow
@@ -115,6 +116,7 @@ class RadioAudioEngine {
         }
 
         active = true
+        micDead = false
         audioRecord?.startRecording()
         audioTrack?.play()
 
@@ -153,6 +155,9 @@ class RadioAudioEngine {
     /** PTT зажата — начинаем передачу. */
     fun talkBegin() {
         if (!active || talking) return
+        if (micDead) {
+            LogManager.addLog("WARN", "RadioAudio", "talkBegin but mic is dead (background capture stopped)")
+        }
         talking = true
         _talkingFlow.value = true
         NativeLib.radioTalkBegin(groupId)
@@ -168,12 +173,26 @@ class RadioAudioEngine {
 
     private fun captureLoop() {
         val buf = ShortArray(FRAME_SAMPLES)
-        while (active && audioRecord?.recordingState == AudioRecord.RECORDSTATE_RECORDING) {
+        while (active) {
+            val rec = audioRecord ?: break
+            if (rec.recordingState != AudioRecord.RECORDSTATE_RECORDING) {
+                if (active) {
+                    micDead = true
+                    LogManager.addLog("WARN", "RadioAudio", "capture loop: recordingState=${rec.recordingState}, mic stopped")
+                }
+                break
+            }
             var read = 0
             while (read < FRAME_SAMPLES) {
                 if (!active) return
-                val n = audioRecord?.read(buf, read, FRAME_SAMPLES - read) ?: return
-                if (n <= 0) return
+                val n = rec.read(buf, read, FRAME_SAMPLES - read)
+                if (n <= 0) {
+                    if (active) {
+                        micDead = true
+                        LogManager.addLog("WARN", "RadioAudio", "capture loop: read()=$n, mic lost")
+                    }
+                    return
+                }
                 read += n
             }
             if (talking && !NativeLib.radioAudioFeed(groupId, buf)) {

tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioOverlayService.kt

@@ -1,10 +1,13 @@
 package com.utun.chat.data
 
+import android.Manifest
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.Service
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
+import android.content.pm.ServiceInfo
 import android.graphics.PixelFormat
 import android.graphics.drawable.GradientDrawable
 import android.os.Build
@@ -18,6 +21,8 @@ import android.view.ViewConfiguration
 import android.view.WindowManager
 import android.widget.TextView
 import androidx.core.app.NotificationCompat
+import androidx.core.app.ServiceCompat
+import androidx.core.content.ContextCompat
 import kotlin.math.abs
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -44,6 +49,12 @@ class RadioOverlayService : Service() {
             Build.VERSION.SDK_INT < Build.VERSION_CODES.M || Settings.canDrawOverlays(ctx)
 
         fun start(ctx: Context) {
+            if (Build.VERSION.SDK_INT >= 34 &&
+                ContextCompat.checkSelfPermission(ctx, Manifest.permission.FOREGROUND_SERVICE_MICROPHONE) !=
+                PackageManager.PERMISSION_GRANTED) {
+                LogManager.addLog("ERROR", "RadioOverlay", "FOREGROUND_SERVICE_MICROPHONE not granted — background mic will be muted")
+                return
+            }
             val i = Intent(ctx, RadioOverlayService::class.java)
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
                 ctx.startForegroundService(i)
@@ -66,7 +77,12 @@ class RadioOverlayService : Service() {
     override fun onCreate() {
         super.onCreate()
         createChannel()
-        startForeground(NOTIF_ID, buildNotification())
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            ServiceCompat.startForeground(this, NOTIF_ID, buildNotification(),
+                ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE)
+        } else {
+            startForeground(NOTIF_ID, buildNotification())
+        }
 
         windowManager = getSystemService(WINDOW_SERVICE) as WindowManager
         if (!canDrawOverlays(this)) {

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/screens/SettingsScreen.kt

@@ -46,7 +46,7 @@ private val CATEGORIES = listOf(
     "config", "tun", "routing", "timers", "bgp", "chat",
     "socket", "control", "dump", "traffic", "debug", "general",
     "nat", "keepalive", "media", "etcp_route", "etcp_dump",
-    "chat_sync", "member_sync", "proxy"
+    "chat_sync", "member_sync", "proxy", "radio"
 )
 private val PROTOCOLS = listOf("tcp", "udp")