chore(frontend): shadcn-svelte / Tailwind / layerchart 工具链初始化

[变更性质]
本轮为维护性依赖与配置初始化，不改变业务页面（页面迁移见后续提交）。

[维护内容]
按 Leader 返工指令，前端 UI 组件库全量迁移 shadcn-svelte，图表渲染
从 echarts 换为 layerchart，需要一次性引入配套依赖与构建配置。

[实现方案]
package.json/pnpm-lock.yaml：tailwindcss@4、@tailwindcss/vite、
tw-animate-css、shadcn-svelte、bits-ui、tailwind-variants、clsx、
tailwind-merge、@lucide/svelte、layerchart、@fontsource-variable/inter
与 @types/node；echarts 保留至页面迁移完成后移除。pnpm-workspace.yaml
声明 allowBuilds（esbuild、@tailwindcss/oxide）。components.json 采用
mira preset，别名 $lib。tsconfig 新增 $lib paths；vite.config.ts 加入
tailwindcss 插件、$lib alias（vitest 需要）与 test 环境配置。
src/lib/components/ 为 shadcn 生成的 UI 组件源码（button/input/label/
card/badge/alert/select/table/tabs/separator/chart），src/lib/utils.ts
为 cn 工具。app.css 引入 tailwind 与 shadcn CSS 变量并调整为 teal
主题（primary #0f766e、radius 0.375rem、双主题 chart-1..5），保留
legacy 选择器（banner/beat/table.data/metric 等），mobileCss.test.ts
依赖其语义断言。

[影响范围]
构建链与主题变量；后续页面提交逐步消费这些组件，npm run check/test/
build 已全绿验证。

1 files changed, 16 insertions, 2 deletions

diff --git a/frontend/package.json b/frontend/package.json
index a60fa56..a294b49 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -12,14 +12,20 @@
     "test:watch": "vitest"
   },
   "devDependencies": {
+    "@fontsource-variable/inter": "^5.3.0",
     "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@tailwindcss/vite": "^4.3.3",
     "@testing-library/svelte": "^5.2.7",
     "@tsconfig/svelte": "^5.0.8",
     "@types/diff": "^7.0.2",
+    "@types/node": "^22.20.3",
     "jsdom": "^26.1.0",
     "playwright": "^1.63.0",
+    "shadcn-svelte": "^1.6.1",
     "svelte": "^5.19.0",
     "svelte-check": "^4.1.4",
+    "tailwindcss": "^4.3.3",
+    "tw-animate-css": "^1.4.0",
     "typescript": "^5.7.3",
     "vite": "^6.3.5",
     "vitest": "^3.2.4"
@@ -29,11 +35,19 @@
     "@codemirror/merge": "^6.7.3",
     "@codemirror/state": "^6.5.2",
     "@codemirror/view": "^6.36.4",
+    "@lucide/svelte": "^1.46.0",
+    "bits-ui": "^2.19.2",
+    "clsx": "^2.1.1",
     "codemirror": "^6.0.1",
     "diff": "^7.0.0",
-    "echarts": "^5.6.0"
+    "echarts": "^5.6.0",
+    "layerchart": "^2.5.0",
+    "tailwind-merge": "^3.7.0",
+    "tailwind-variants": "^3.3.1"
   },
   "allowScripts": {
-    "[email protected]": true
+    "[email protected]": true,
+    "[email protected]": true,
+    "@tailwindcss/[email protected]": true
   }
 }