feat: 定义仓库协议与用例（含会话）

IosClientKit/Sources/CoreDomain/HomeUseCase.swift

@@ -1,7 +1,6 @@
 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
 
@@ -9,8 +8,13 @@ public struct HomeUseCase: Sendable {
         self.repository = repository
     }
 
-    /// Kotlin: Flow<HomeData> → Swift: AsyncThrowingStream<HomeData, Error>
+    /// 已登录首页。
     public func observeHome() -> AsyncThrowingStream<HomeData, Error> {
         repository.observeHome()
     }
+
+    /// 游客首页。
+    public func observeGuestHome() -> AsyncThrowingStream<HomeData, Error> {
+        repository.observeGuestHome()
+    }
 }