feat(ui): UI 骨架基线 — 3 Tab + RecordSheet + Quick/Archive 流程占位

替换 Xcode 默认模板:
- 删除 ContentView/Item/__App
- 新增 App/TijiApp(SwiftData ModelContainer)、RootView(3 Tab + RecordSheet)
- DesignSystem:Tokens(色板/字体/圆角)+ Components(卡片/按钮/Chip)
- Models:Indicator / Report / DiaryEntry @Model 初版
- Features:Home / Quick(A1-A3)/ Archive(B1-B5)/ Record / Trends / Me 静态 UI

W2 AI 基座工作将在此基线上叠加。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

体己/DesignSystem/Tokens.swift

@@ -0,0 +1,62 @@
+import SwiftUI
+
+enum Tj {
+    enum Palette {
+        static let ink       = Color(red: 0.165, green: 0.153, blue: 0.137)
+        static let ink2      = Color(red: 0.286, green: 0.275, blue: 0.251)
+        static let inkSoft   = Color(red: 0.459, green: 0.447, blue: 0.424)
+        static let sand      = Color(red: 0.976, green: 0.969, blue: 0.949)
+        static let sand2     = Color(red: 0.929, green: 0.918, blue: 0.886)
+        static let sand3     = Color(red: 0.878, green: 0.859, blue: 0.816)
+        static let paper     = Color(red: 0.992, green: 0.988, blue: 0.973)
+        static let line      = Color(red: 0.875, green: 0.863, blue: 0.831)
+        static let lineSoft  = Color(red: 0.925, green: 0.918, blue: 0.890)
+        static let text      = Color(red: 0.149, green: 0.137, blue: 0.118)
+        static let text2     = Color(red: 0.420, green: 0.408, blue: 0.384)
+        static let text3     = Color(red: 0.616, green: 0.604, blue: 0.580)
+        static let brick     = Color(red: 0.886, green: 0.388, blue: 0.314)
+        static let brickSoft = Color(red: 0.976, green: 0.863, blue: 0.824)
+        static let amber     = Color(red: 0.871, green: 0.627, blue: 0.314)
+        static let leaf      = Color(red: 0.180, green: 0.357, blue: 0.518)
+        static let leafSoft  = Color(red: 0.867, green: 0.910, blue: 0.941)
+        static let darkBg    = Color(red: 0.051, green: 0.063, blue: 0.059)
+    }
+
+    enum Radius {
+        static let xs: CGFloat = 8
+        static let sm: CGFloat = 14
+        static let md: CGFloat = 20
+        static let lg: CGFloat = 28
+        static let xl: CGFloat = 36
+        static let pill: CGFloat = 999
+    }
+
+    enum Shadow {
+        static func card() -> some View {
+            Color.clear
+        }
+    }
+}
+
+extension Font {
+    static func tjTitle(_ size: CGFloat = 30) -> Font { .system(size: size, weight: .bold, design: .default) }
+    static func tjH2(_ size: CGFloat = 18) -> Font { .system(size: size, weight: .bold, design: .default) }
+    static func tjMono(_ size: CGFloat = 11) -> Font { .system(size: size, weight: .regular, design: .monospaced) }
+    static func tjSerifBody(_ size: CGFloat = 17) -> Font { .system(size: size, weight: .regular, design: .default) }
+}
+
+extension View {
+    func tjCard(bordered: Bool = false, radius: CGFloat = Tj.Radius.md) -> some View {
+        self
+            .background(
+                RoundedRectangle(cornerRadius: radius, style: .continuous)
+                    .fill(Tj.Palette.paper)
+            )
+            .overlay(
+                RoundedRectangle(cornerRadius: radius, style: .continuous)
+                    .strokeBorder(Tj.Palette.lineSoft, lineWidth: bordered ? 1 : 0)
+            )
+            .shadow(color: bordered ? .clear : Color(red: 0.196, green: 0.157, blue: 0.098).opacity(0.05),
+                    radius: 2, x: 0, y: 1)
+    }
+}