chore: 初始化 Android 工程骨架（Compose + Gradle 8.14/AGP 8.13.1）

app/src/main/res/drawable/ic_launcher_foreground.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- 占位启动图标前景：圆环 + 中心菱形，Task 14 可再美化。 -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M54,30 C40,30 30,40 30,54 C30,68 40,78 54,78 C68,78 78,68 78,54 C78,40 68,30 54,30 Z M54,38 C62.8,38 70,45.2 70,54 C70,62.8 62.8,70 54,70 C45.2,70 38,62.8 38,54 C38,45.2 45.2,38 54,38 Z" />
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M54,46 L60,54 L54,62 L48,54 Z" />
+</vector>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values/ic_launcher_background.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- 自适应图标背景色（占位绿） -->
+    <color name="ic_launcher_background">#34C759</color>
+</resources>

app/src/main/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">RingHealth</string>
+</resources>

app/src/main/res/values/themes.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- 启动主题：无 ActionBar，状态栏透明并适配浅色图标。Compose 内部主题在 Task 2+ 建立。 -->
+    <style name="Theme.RingHealth" parent="android:Theme.Material.Light.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+        <item name="android:windowLightStatusBar">true</item>
+    </style>
+</resources>

app/src/main/res/xml/backup_rules.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- 阶段一不备份任何内容，规则留空。 -->
+<full-backup-content />

app/src/main/res/xml/data_extraction_rules.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Android 12+ 数据迁移规则：云备份与设备间传输均不排除任何内容。 -->
+<data-extraction-rules>
+    <cloud-backup />
+    <device-transfer />
+</data-extraction-rules>