feat: 重设计 UI/UX — 展示/管理分离 + shadcn/ui + Admin 后台

- 引入 shadcn/ui（base-nova 风格，Tailwind v4，14 个组件）
- 新增 Admin 后台路由架构：/admin（总览）、/admin/bookmarks（管理）
- 重写首页为纯展示书签导航（BookmarkCard + CategoryGrid）
- 新增 Admin 侧边栏导航（AdminSidebar + SidebarProvider）
- 书签管理页：双栏布局 + Dialog 表单 + DnD 排序 + Toast 通知
- 修复 IconPicker overflow 裁切（改用 Dialog portal）
- 修复嵌套 button hydration 错误（base-ui render prop）
- 删除旧组件（CategorySection/BookmarkItem/IconPicker）和旧路由
- 所有新依赖归入 root catalog
- 更新 AGENTS.md 文档（目录结构、shadcn 模式、render prop 规范）

apps/server/package.json

@@ -23,6 +23,10 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
+    "@base-ui/react": "catalog:",
+    "@dnd-kit/dom": "catalog:",
+    "@dnd-kit/react": "catalog:",
+    "@fontsource-variable/geist": "catalog:",
     "@orpc/client": "catalog:",
     "@orpc/contract": "catalog:",
     "@orpc/openapi": "catalog:",
@@ -34,14 +38,18 @@
     "@tanstack/react-router": "catalog:",
     "@tanstack/react-router-ssr-query": "catalog:",
     "@tanstack/react-start": "catalog:",
+    "better-auth": "catalog:",
+    "class-variance-authority": "catalog:",
+    "clsx": "catalog:",
     "drizzle-orm": "catalog:",
+    "lucide-react": "catalog:",
+    "next-themes": "catalog:",
     "postgres": "catalog:",
     "react": "catalog:",
     "react-dom": "catalog:",
-    "@dnd-kit/dom": "catalog:",
-    "@dnd-kit/react": "catalog:",
-    "better-auth": "catalog:",
-    "lucide-react": "catalog:",
+    "sonner": "catalog:",
+    "tailwind-merge": "catalog:",
+    "tw-animate-css": "catalog:",
     "uuid": "catalog:",
     "zod": "catalog:"
   },
@@ -55,7 +63,7 @@
     "@tanstack/react-router-devtools": "catalog:",
     "@types/bun": "catalog:",
     "@vitejs/plugin-react": "catalog:",
-    "babel-plugin-react-compiler": "^1.0.0",
+    "babel-plugin-react-compiler": "catalog:",
     "drizzle-kit": "catalog:",
     "nitro": "catalog:",
     "tailwindcss": "catalog:",