feat(skill): REQ-20260406-0004 技能三层分离重构（7主线+16插件）

批次1: req-prd 瘦身 + req-design 重定位 + dev-coding 聚焦
批次2: dev-review 新建 + review-checklist 插件
批次3: dev-integration 新建 + req-compare 拆出
批次4: 插件完善 (req-research/db-migration/dev-scaffold/deploy-rollback)
批次5: 平台拆分 (dev-ios/dev-android/dev-mcp/dev-pda) + dev 分组更新
批次6: marketplace.json 32→44 plugins

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills-dev/dev-android-plugin/skills/SKILL.md

@@ -0,0 +1,54 @@
+---
+name: dev-android
+description: Android 开发插件。Kotlin + Jetpack Compose + Hilt 依赖注入。当涉及 Android 开发任务时按需加载。
+---
+
+# Android 开发插件 (dev-android)
+
+## 架构：MVVM + Hilt
+
+```
+android-app/app/src/main/
+├── java/com/project/
+│   ├── ui/              # Compose 屏幕 + 组件
+│   ├── data/            # API + Repository + 本地存储
+│   ├── domain/          # 业务逻辑
+│   └── di/              # Hilt 依赖注入
+└── res/                 # 资源文件
+```
+
+## 代码规范
+
+```kotlin
+@HiltViewModel
+class TaskViewModel @Inject constructor(
+    private val taskRepository: TaskRepository
+) : ViewModel() {
+
+    private val _tasks = MutableStateFlow<List<Task>>(emptyList())
+    val tasks: StateFlow<List<Task>> = _tasks.asStateFlow()
+
+    fun fetchTasks() {
+        viewModelScope.launch {
+            taskRepository.getTasks()
+                .collect { _tasks.value = it }
+        }
+    }
+}
+
+@Composable
+fun TaskListScreen(viewModel: TaskViewModel = hiltViewModel()) {
+    val tasks by viewModel.tasks.collectAsState()
+    LazyColumn {
+        items(tasks) { task -> TaskItem(task = task) }
+    }
+}
+```
+
+## 构建
+
+```bash
+./gradlew assembleDebug      # Debug 构建
+./gradlew assembleRelease    # Release 构建
+./gradlew test               # 测试
+```