chore: core 多模块骨架

IosClientKit/Sources/CoreNetwork/APIClient.swift

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+import Foundation
+
+/// 网络错误。
+public enum NetworkError: Error, Sendable {
+    case invalidResponse
+    case http(statusCode: Int)
+    case decoding(String)
+}
+
+/// 通用 HTTP 客户端（对应 Android Retrofit 的最小抽象）。
+public protocol APIClient: Sendable {
+    func get<T: Decodable & Sendable>(_ url: URL) async throws -> T
+}
+
+/// 基于 URLSession 的 APIClient 实现。
+public struct URLSessionAPIClient: APIClient {
+    private let session: URLSession
+
+    public init(session: URLSession = .shared) {
+        self.session = session
+    }
+
+    public func get<T: Decodable & Sendable>(_ url: URL) async throws -> T {
+        let (data, response) = try await session.data(from: url)
+        guard let http = response as? HTTPURLResponse else {
+            throw NetworkError.invalidResponse
+        }
+        guard (200..<300).contains(http.statusCode) else {
+            throw NetworkError.http(statusCode: http.statusCode)
+        }
+        do {
+            return try JSONDecoder().decode(T.self, from: data)
+        } catch {
+            throw NetworkError.decoding(error.localizedDescription)
+        }
+    }
+}

IosClientKit/Sources/CoreNetwork/HomeDTO.swift

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+import Foundation
+
+/// 示例网络 DTO（与领域 Model 分离，对应 Kotlin @Serializable 的 data class）。
+/// 注意：DTO 只承载接口字段，不直接进入 UI；领域层用 CoreModel.HomeData。
+public struct HomeDTO: Codable, Sendable {
+    public let id: String
+    public let greeting: String
+    public let habits: [HabitDTO]
+}
+
+public struct HabitDTO: Codable, Sendable {
+    public let id: String
+    public let title: String
+    public let checkedIn: Bool
+}