chore: core 多模块骨架

IosClientKit/Sources/DesignSystem/DesignTokens.swift

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+import SwiftUI
+
+/// 设计 tokens（颜色 / 间距 / 圆角），对应 Android DesignSystem。
+public enum DS {
+    public enum Color {
+        public static let accent = SwiftUI.Color.accentColor
+        public static let success = SwiftUI.Color.green
+        public static let danger = SwiftUI.Color.red
+        public static let warning = SwiftUI.Color.orange
+    }
+
+    public enum Spacing {
+        public static let xs: CGFloat = 4
+        public static let sm: CGFloat = 8
+        public static let md: CGFloat = 16
+        public static let lg: CGFloat = 24
+        public static let xl: CGFloat = 32
+    }
+
+    public enum Radius {
+        public static let sm: CGFloat = 8
+        public static let md: CGFloat = 12
+        public static let lg: CGFloat = 16
+    }
+}