chore: core 多模块骨架

IosClientKit/Sources/CoreDomain/HomeRepository.swift

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+import CoreModel
+
+/// Home 数据仓库协议（定义在 domain 层，实现放 CoreRepository）。
+/// Kotlin: interface HomeRepository { fun observeHome(): Flow<HomeData> }
+public protocol HomeRepository: Sendable {
+    /// Kotlin: Flow<HomeData> → Swift: AsyncThrowingStream<HomeData, Error>
+    func observeHome() -> AsyncThrowingStream<HomeData, Error>
+}

IosClientKit/Sources/CoreDomain/HomeUseCase.swift

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+import CoreModel
+
+/// 获取 Home 数据的用例。
+/// Kotlin: class HomeUseCase(...) { suspend operator fun invoke(): HomeData }
+public struct HomeUseCase: Sendable {
+    private let repository: HomeRepository
+
+    public init(repository: HomeRepository) {
+        self.repository = repository
+    }
+
+    /// Kotlin: Flow<HomeData> → Swift: AsyncThrowingStream<HomeData, Error>
+    public func observeHome() -> AsyncThrowingStream<HomeData, Error> {
+        repository.observeHome()
+    }
+}