app: Scaffold Android TV PeerTube client (MVP)

Start the SmartTube-inspired PeerTube TV client as a Kotlin + Compose
for TV app. It targets any PeerTube instance (v1 API), with JTube as
the default, and covers login 0, local/own video listings 1-2, search
3, subscriptions 4, server-backed history 5 and HLS/progressive
playback with watching reports 6.

Password is only used for the OAuth password grant and never stored;
tokens are kept in EncryptedSharedPreferences. Building needs JDK 17+
(see README); the Gradle wrapper is checked in so no local Gradle is
required.

app/src/main/AndroidManifest.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <uses-feature
+        android:name="android.software.leanback"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.touchscreen"
+        android:required="false" />
+
+    <application
+        android:name=".JTubeApp"
+        android:allowBackup="false"
+        android:banner="@drawable/app_banner"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/Theme.JTubeTV">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="landscape">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>