fix(fdroid): Firebase-free stubs for expo-notifications

fdroid/expo-notifications-patches/service/ExpoFirebaseMessagingService.kt

@@ -0,0 +1,14 @@
+package expo.modules.notifications.service
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+
+/**
+ * Stub ExpoFirebaseMessagingService (Firebase-free) for F-Droid builds.
+ * FCM messaging is not available in this build — extends Service (not FirebaseMessagingService).
+ * Referenced in AndroidManifest.xml but never actually used without Firebase.
+ */
+open class ExpoFirebaseMessagingService : Service() {
+  override fun onBind(intent: Intent?): IBinder? = null
+}