fix(devices): use real Bluetooth MAC as device identity on Android 12+

Without BLUETOOTH_CONNECT, Android 12+ returns the fixed placeholder
02:00:00:00:00:00 for every Bluetooth device's address, so all BT
devices collapsed onto the same equalizer identity and renames
appeared to duplicate devices after re-pairing.

Declare the permission, add a requestBluetoothConnect channel method
mirroring the existing notification-permission flow, guard the
placeholder in deviceToMap() with a colon-sanitized name-based
fallback id (replacing the dead 00:00:00:00:00:00 branch), and
re-emit the active device after the grant so already-connected
devices pick up their real MAC without a reconnect.

Work unit 1/2 of bt-device-identity (Kotlin plumbing).

android/app/src/main/AndroidManifest.xml

@@ -14,6 +14,7 @@
     <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
 
     <application
         android:label="PluriWave"