Keep the Android connection alive in the background

The session moves from the connection screen's ViewModel into an
app-wide SessionController, and a foreground service keeps the process
running while connected:

- Its notification shows the server and status and offers Mute, Deafen
  and Disconnect.
- It declares microphone use only once the microphone is handed to the
  connection, as Android requires that permission to be granted then.
- It holds a low-latency Wi-Fi lock and a CPU wake lock, since voice
  goes out every 20 ms.
- When the system moves to another network, the session reconnects to
  where it was, as its socket stays bound to the old one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -3,6 +3,12 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
 
     <application
         android:name=".Ts3Application"
@@ -18,5 +24,10 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <service
+            android:name=".ConnectionService"
+            android:exported="false"
+            android:foregroundServiceType="mediaPlayback|microphone" />
     </application>
 </manifest>