feat(web): vite + vue 3 + ts + tailwind + naive ui scaffolding

web/src/App.vue

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+<template>
+  <div class="min-h-screen flex items-center justify-center">
+    <p class="text-lg">Agent Coding Workflow — scaffolding ready.</p>
+  </div>
+</template>
+
+<script setup lang="ts">
+// 占位组件：I5 接入 router 后改写为 RouterView + NConfigProvider。
+</script>

web/src/main.ts

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+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
+import App from './App.vue'
+
+import './styles/tailwind.css'
+import './styles/tokens.css'
+
+const app = createApp(App)
+app.use(createPinia())
+app.mount('#app')

web/src/styles/tailwind.css

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+@import "tailwindcss";
+
+@variant dark (&:where(.dark, .dark *));

web/src/styles/tokens.css

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+:root {
+  --color-bg: #ffffff;
+  --color-fg: #1a1a1a;
+  --color-muted: #6b7280;
+  --color-accent: #2563eb;
+}
+
+.dark {
+  --color-bg: #0f1115;
+  --color-fg: #e5e7eb;
+  --color-muted: #9ca3af;
+  --color-accent: #60a5fa;
+}
+
+body {
+  background: var(--color-bg);
+  color: var(--color-fg);
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
+    Arial, "Microsoft YaHei", sans-serif;
+}