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/dashboard/dashboard.module.ts

@@ -0,0 +1,16 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Room } from '../entities/room.entity';
+import { Student } from '../entities/student.entity';
+import { Occupancy } from '../entities/occupancy.entity';
+import { Bill } from '../entities/bill.entity';
+import { RoomExpense } from '../entities/room-expense.entity';
+import { DashboardService } from './dashboard.service';
+import { DashboardController } from './dashboard.controller';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Room, Student, Occupancy, Bill, RoomExpense])],
+  controllers: [DashboardController],
+  providers: [DashboardService],
+})
+export class DashboardModule {}