feat: initial commit with Nuxt 3 student management system

- Add Nuxt 3 + Prisma + SQLite full-stack setup
- Add student CRUD API with batch import/export
- Add stats dashboard with gender/class distribution
- Add target community settings feature
- Add Docker deployment support (Dockerfile + docker-compose)
- Add README with development and deployment instructions

layouts/default.vue

@@ -0,0 +1,34 @@
+<template>
+  <div class="min-h-screen bg-gray-100">
+    <header class="bg-white shadow">
+      <div class="max-w-7xl mx-auto px-4 py-4 flex items-center justify-between">
+        <h1 class="text-xl font-bold text-gray-800">📚 学生数据管理系统</h1>
+        <nav class="flex gap-4">
+          <NuxtLink 
+            to="/" 
+            class="px-4 py-2 rounded-lg hover:bg-gray-100"
+            :class="$route.path === '/' ? 'bg-blue-100 text-blue-600' : 'text-gray-600'"
+          >
+            📊 数据概览
+          </NuxtLink>
+          <NuxtLink 
+            to="/students" 
+            class="px-4 py-2 rounded-lg hover:bg-gray-100"
+            :class="$route.path === '/students' ? 'bg-blue-100 text-blue-600' : 'text-gray-600'"
+          >
+            👨‍🎓 学生列表
+          </NuxtLink>
+        </nav>
+      </div>
+    </header>
+    <main class="max-w-7xl mx-auto px-4 py-6">
+      <slot />
+    </main>
+  </div>
+</template>
+
+<style>
+* {
+  box-sizing: border-box;
+}
+</style>