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/App/TijiApp.swift

@@ -0,0 +1,26 @@
+import SwiftUI
+import SwiftData
+
+@main
+struct TijiApp: App {
+    var sharedModelContainer: ModelContainer = {
+        let schema = Schema([
+            Indicator.self,
+            Report.self,
+            DiaryEntry.self,
+        ])
+        let config = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false)
+        do {
+            return try ModelContainer(for: schema, configurations: [config])
+        } catch {
+            fatalError("Could not create ModelContainer: \(error)")
+        }
+    }()
+
+    var body: some Scene {
+        WindowGroup {
+            RootView()
+        }
+        .modelContainer(sharedModelContainer)
+    }
+}