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/build.gradle.kts

@@ -173,6 +173,7 @@ dependencies {
     implementation(libs.media3.exoplayer)
     implementation(libs.media3.session)
     implementation(libs.media3.datasource.okhttp)
+    implementation(libs.mediarouter)
 
     implementation(libs.coil.compose)
     implementation(libs.coil.network.okhttp)

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"

android/app/src/main/java/com/fabledsword/minstrel/player/output/OutputRoute.kt

@@ -0,0 +1,72 @@
+package com.fabledsword.minstrel.player.output
+
+import androidx.mediarouter.media.MediaRouter
+
+/**
+ * Narrow domain model for an audio output route. Independent of
+ * [MediaRouter.RouteInfo] so the picker UI can preview without an
+ * Android framework presence (RouteInfo can't be constructed in
+ * JVM tests, mirroring the LikeMediaCallback constraint).
+ *
+ * The [protocol] field is a forward-compatibility hook for the
+ * UPnP / DLNA / Sonos / Cast slice (scope captured in
+ * docs/superpowers/specs/2026-06-03-android-output-picker-upnp-scope.md).
+ * THIS slice always sets `protocol = SYSTEM` — the system-route
+ * categories MediaRouter surfaces (built-in / wired / Bluetooth).
+ */
+data class OutputRoute(
+    val id: String,
+    val name: String,
+    val description: String?,
+    val kind: Kind,
+    val protocol: Protocol,
+    val isConnected: Boolean,
+) {
+    enum class Kind { BuiltIn, Wired, Bluetooth, Cast, Other }
+
+    enum class Protocol {
+        /** System-managed routes — built-in speaker, wired, Bluetooth. */
+        SYSTEM,
+
+        /** Generic UPnP / DLNA renderers — reserved for the next slice. */
+        UPNP,
+
+        /** Chromecast via the Cast SDK — reserved for a later slice. */
+        CAST,
+
+        /** Sonos via the Sonos extension on top of UPnP — reserved. */
+        SONOS,
+    }
+
+    companion object {
+        /**
+         * Lift a MediaRouter [route] into the domain model. Kind is
+         * inferred from [MediaRouter.RouteInfo.getDeviceType]; unknown
+         * device types fall through to [Kind.Other]. The
+         * `connectionState` proxy is good enough for the chip's
+         * "Connected"/"Available" subtitle.
+         */
+        fun fromRouteInfo(route: MediaRouter.RouteInfo): OutputRoute {
+            val kind = when (route.deviceType) {
+                MediaRouter.RouteInfo.DEVICE_TYPE_BUILTIN_SPEAKER -> Kind.BuiltIn
+                MediaRouter.RouteInfo.DEVICE_TYPE_WIRED_HEADSET,
+                MediaRouter.RouteInfo.DEVICE_TYPE_WIRED_HEADPHONES,
+                -> Kind.Wired
+                MediaRouter.RouteInfo.DEVICE_TYPE_BLUETOOTH_A2DP -> Kind.Bluetooth
+                MediaRouter.RouteInfo.DEVICE_TYPE_TV -> Kind.Other
+                MediaRouter.RouteInfo.DEVICE_TYPE_SPEAKER -> Kind.Other
+                else -> Kind.Other
+            }
+            val connected =
+                route.connectionState == MediaRouter.RouteInfo.CONNECTION_STATE_CONNECTED
+            return OutputRoute(
+                id = route.id,
+                name = route.name,
+                description = route.description,
+                kind = kind,
+                protocol = Protocol.SYSTEM,
+                isConnected = connected,
+            )
+        }
+    }
+}

android/gradle/libs.versions.toml

@@ -22,6 +22,7 @@ kotlinx-coroutines = "1.9.0"
 kotlinx-datetime = "0.6.1"
 kotlinx-serialization-converter = "1.0.0"
 media3 = "1.10.1"
+mediarouter = "1.7.0"
 coil = "3.0.0-rc02"
 palette = "1.0.0"
 timber = "5.0.1"
@@ -71,6 +72,7 @@ media3-exoplayer = { module = "androidx.media3:media3-exoplayer", version.ref =
 media3-session = { module = "androidx.media3:media3-session", version.ref = "media3" }
 media3-datasource-okhttp = { module = "androidx.media3:media3-datasource-okhttp", version.ref = "media3" }
 media3-ui = { module = "androidx.media3:media3-ui", version.ref = "media3" }
+mediarouter = { module = "androidx.mediarouter:mediarouter", version.ref = "mediarouter" }
 coil-compose = { module = "io.coil-kt.coil3:coil-compose", version.ref = "coil" }
 coil-network-okhttp = { module = "io.coil-kt.coil3:coil-network-okhttp", version.ref = "coil" }
 androidx-palette = { module = "androidx.palette:palette-ktx", version.ref = "palette" }