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

server/utils/prisma.ts

@@ -0,0 +1,16 @@
+import { PrismaClient } from '@prisma/client'
+
+const globalForPrisma = globalThis as unknown as {
+  prisma: PrismaClient | undefined
+}
+
+export const prisma = globalForPrisma.prisma ?? new PrismaClient()
+
+if (process.env.NODE_ENV !== 'production') globalForPrisma.prisma = prisma
+
+// 默认目标小区配置
+export const defaultCommunities = [
+  '恒大雅苑', '百悦尚城', '金域中央', '御泉山', '金域华府',
+  '金悦香树', '凯旋国际', '康华医院', '幸福公馆', '御花苑',
+  '景湖湾畔', '景湖时代城', '景湖花园', '香树丽舍', '恒大御景'
+]