feat(android): output picker foundation - mediarouter + OutputRoute

Bluetooth slice (1/5). Adds the androidx.mediarouter 1.7.0 dep,
declares BLUETOOTH_CONNECT (needed on Android 12+ to enumerate
paired BT devices by name), and lays down the OutputRoute domain
model.

OutputRoute decouples the picker UI from MediaRouter.RouteInfo
(framework class, can't be constructed in JVM tests - same
constraint we hit with LikeMediaCallback). The Protocol enum
includes UPNP/CAST/SONOS placeholders so the next slice slots in
without a data-model rename - see
docs/superpowers/specs/2026-06-03-android-output-picker-upnp-scope.md
for the deferred work.

Controller + ViewModel + Compose UI land in follow-up commits.

android/app/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
 
     <application
         android:name=".MinstrelApplication"