feat: initial Android port of tiennm99/loto

Native Android port of the SvelteKit Lô tô hội chợ Tân Tân web app.

Stack:
- Kotlin 2.1 + Jetpack Compose + Material 3
- Single Activity, single Gradle module (:app)
- Audio: AndroidX Media3 ExoPlayer with bundled MP3 voice clips
- Settings: DataStore Preferences with legacy masterMode migration
- minSdk 24, targetSdk 35, JDK 17

Game logic:
- 9x9 player card with exactly 5 numbers per row AND per column
- Soft constraint: no 3 consecutive filled columns (rejection-sampled)
- 11x9 ones-digit-aligned master tracking board
- Bingo / Cho ("waiting") state machine ported from PlayerBoard.svelte
- Forward-only auto-tick from MasterPanel via app-scoped CallBus

Audio:
- 184 MP3s pre-generated with Microsoft Edge TTS (Hoai My, Nam Minh)
- ExoPlayer playlist for cho + N gapless sequence
- Token-based cancellation matching the web voice.js semantics

CI:
- build-debug.yml: lint + test + assembleDebug on push/PR
- release.yml: signed AAB+APK on v* tag, env-driven keystore

android/app/src/androidTest/java/com/miti99/loto/MainActivityComposeSmokeTest.kt

@@ -0,0 +1,46 @@
+package com.miti99.loto
+
+import androidx.compose.ui.test.assertCountEquals
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onAllNodesWithTag
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performClick
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Compose UI smoke test — verifies the full cold-start → generate-grid flow.
+ *
+ * Requires a connected device or emulator. Run via:
+ *   ./gradlew :app:connectedDebugAndroidTest
+ *
+ * Phase 11 spec: launch MainActivity, assert "Tạo bảng mới" shown,
+ * click it, assert all 81 player_cell nodes are rendered.
+ */
+@RunWith(AndroidJUnit4::class)
+class MainActivityComposeSmokeTest {
+
+    @get:Rule
+    val rule = createAndroidComposeRule<MainActivity>()
+
+    @Test
+    fun generate_button_is_visible_on_cold_start() {
+        rule.onNodeWithText("Tạo bảng mới").assertExists()
+    }
+
+    @Test
+    fun generate_button_creates_81_player_cells() {
+        // Tap the generate button — no confirmation dialog on first tap (grid is null)
+        rule.onNodeWithText("Tạo bảng mới").performClick()
+
+        // Wait up to 5 s for all 81 cells to appear (grid generation is synchronous
+        // but Compose may take a frame to recompose)
+        rule.waitUntil(timeoutMillis = 5_000) {
+            rule.onAllNodesWithTag("player_cell").fetchSemanticsNodes().size == 81
+        }
+
+        rule.onAllNodesWithTag("player_cell").assertCountEquals(81)
+    }
+}

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.VIBRATE" />
+
+    <application
+        android:name=".LotoApp"
+        android:allowBackup="false"
+        android:dataExtractionRules="@xml/backup_rules"
+        android:fullBackupContent="false"
+        android:icon="@mipmap/ic_launcher"
+        android:roundIcon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="false"
+        android:theme="@style/Theme.Loto">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:configChanges="orientation|screenSize|keyboardHidden|uiMode"
+            android:screenOrientation="portrait"
+            android:theme="@style/Theme.Loto">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+
+</manifest>

android/app/src/main/assets/audio/manifest.json

@@ -0,0 +1,16 @@
+{
+  "voices": [
+    {
+      "id": "hoai-my",
+      "edgeName": "vi-VN-HoaiMyNeural",
+      "label": "Hoai My (nữ)",
+      "gender": "female"
+    },
+    {
+      "id": "nam-minh",
+      "edgeName": "vi-VN-NamMinhNeural",
+      "label": "Nam Minh (nam)",
+      "gender": "male"
+    }
+  ]
+}