feat(android): :app module skeleton — Compose Activity + manifest

M8 phase 1.2. AndroidManifest declares FGS mediaPlayback +
POST_NOTIFICATIONS permissions ahead of the player phase. Activity
hosts a single Compose Scaffold for now; nav graph lands in phase 5.

Launcher icons reused from flutter_client/ (same applicationId means
same brand at cutover). MinstrelApplication referenced in manifest
but the class itself lands in Task 1.3 — manifest class names are
resolved at install time, not build time, so the intermediate commit
still builds.

@AndroidEntryPoint deferred to Task 1.3 alongside @HiltAndroidApp on
MinstrelApplication (Hilt KSP errors without an annotated Application).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
+    <application
+        android:name=".MinstrelApplication"
+        android:allowBackup="false"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Minstrel"
+        android:usesCleartextTraffic="true"
+        tools:targetApi="34">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.Minstrel">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <!-- Media3 MediaSessionService is registered in Phase 6 (Task 6.2). -->
+    </application>
+</manifest>