feat: 恭学教育基地管理系统初始提交

- 后端: NestJS 11 + TypeORM + JWT认证 + SQLite/MySQL
- 前端: React 19 + Ant Design 6 + Vite 8 + ECharts
- 功能模块: 数据面板、学生管理、宿舍管理、入住管理、费用录入、账单管理、教室管理、押金管理、操作日志、账号管理
- 支持Docker一键部署

backend/src/entities/index.ts

@@ -0,0 +1,13 @@
+export { Student } from './student.entity';
+export { Room } from './room.entity';
+export { Occupancy } from './occupancy.entity';
+export { RoomExpense } from './room-expense.entity';
+export { PersonalExpense } from './personal-expense.entity';
+export { Bill } from './bill.entity';
+export { BillItem } from './bill-item.entity';
+export { User } from './user.entity';
+export { OperationLog } from './operation-log.entity';
+export { Deposit } from './deposit.entity';
+export { Classroom } from './classroom.entity';
+export { Tenant } from './tenant.entity';
+export { ClassroomRental } from './classroom-rental.entity';