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。

2 files changed, 55 insertions, 0 deletions

diff --git a/frontend/src/lib/components/ui/input/index.ts b/frontend/src/lib/components/ui/input/index.ts
new file mode 100644
index 0000000..f47b6d3
--- /dev/null
+++ b/frontend/src/lib/components/ui/input/index.ts
@@ -0,0 +1,7 @@
+import Root from "./input.svelte";
+
+export {
+	Root,
+	//
+	Root as Input,
+};
diff --git a/frontend/src/lib/components/ui/input/input.svelte b/frontend/src/lib/components/ui/input/input.svelte
new file mode 100644
index 0000000..549c6b8
--- /dev/null
+++ b/frontend/src/lib/components/ui/input/input.svelte
@@ -0,0 +1,48 @@
+<script lang="ts">
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import type { HTMLInputAttributes, HTMLInputTypeAttribute } from "svelte/elements";
+
+	type InputType = Exclude<HTMLInputTypeAttribute, "file">;
+
+	type Props = WithElementRef<
+		Omit<HTMLInputAttributes, "type"> &
+			({ type: "file"; files?: FileList } | { type?: InputType; files?: undefined })
+	>;
+
+	let {
+		ref = $bindable(null),
+		value = $bindable(),
+		type,
+		files = $bindable(),
+		class: className,
+		"data-slot": dataSlot = "input",
+		...restProps
+	}: Props = $props();
+</script>
+
+{#if type === "file"}
+	<input
+		bind:this={ref}
+		data-slot={dataSlot}
+		class={cn(
+			"bg-input/20 dark:bg-input/30 border-input focus-visible:border-ring focus-visible:ring-ring/30 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:aria-invalid:border-destructive/50 h-7 rounded-md border px-2 py-0.5 text-sm transition-colors file:h-6 file:text-xs/relaxed file:font-medium focus-visible:ring-2 aria-invalid:ring-2 md:text-xs/relaxed w-full min-w-0 outline-none file:inline-flex file:border-0 file:bg-transparent file:text-foreground placeholder:text-muted-foreground disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
+			className
+		)}
+		type="file"
+		bind:files
+		bind:value
+		{...restProps}
+	/>
+{:else}
+	<input
+		bind:this={ref}
+		data-slot={dataSlot}
+		class={cn(
+			"bg-input/20 dark:bg-input/30 border-input focus-visible:border-ring focus-visible:ring-ring/30 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:aria-invalid:border-destructive/50 h-7 rounded-md border px-2 py-0.5 text-sm transition-colors file:h-6 file:text-xs/relaxed file:font-medium focus-visible:ring-2 aria-invalid:ring-2 md:text-xs/relaxed w-full min-w-0 outline-none file:inline-flex file:border-0 file:bg-transparent file:text-foreground placeholder:text-muted-foreground disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
+			className
+		)}
+		{type}
+		bind:value
+		{...restProps}
+	/>
+{/if}