feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

apps/server/src/classrooms/classrooms.module.ts

@@ -0,0 +1,15 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Classroom } from '../entities/classroom.entity';
+import { ClassroomRental } from '../entities/classroom-rental.entity';
+import { ClassroomsService } from './classrooms.service';
+import { ClassroomsController } from './classrooms.controller';
+import { OperationLogsModule } from '../operation-logs/operation-logs.module';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Classroom, ClassroomRental]), OperationLogsModule],
+  controllers: [ClassroomsController],
+  providers: [ClassroomsService],
+  exports: [ClassroomsService],
+})
+export class ClassroomsModule {}