chore: core 多模块骨架

IosClientKit/Sources/CoreModel/Habit.swift

@@ -0,0 +1,27 @@
+import Foundation
+
+/// 一个打卡习惯（对应 Android 端 Habit）。
+public struct Habit: Identifiable, Hashable, Sendable {
+    public let id: String
+    public let title: String
+    /// 备注 / 目标描述。
+    public let detail: String
+    /// 今日是否已打卡。
+    public let isCheckedInToday: Bool
+    /// 连续打卡天数。
+    public let streakDays: Int
+
+    public init(
+        id: String,
+        title: String,
+        detail: String,
+        isCheckedInToday: Bool,
+        streakDays: Int
+    ) {
+        self.id = id
+        self.title = title
+        self.detail = detail
+        self.isCheckedInToday = isCheckedInToday
+        self.streakDays = streakDays
+    }
+}