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/classroom-rentals/dto/rental.dto.ts

@@ -0,0 +1,61 @@
+import { IsOptional, IsString, IsNotEmpty, IsInt, IsNumber, IsEnum, IsDateString } from 'class-validator';
+
+export class CreateRentalDto {
+  @IsInt()
+  classroomId: number;
+
+  @IsInt()
+  tenantId: number;
+
+  @IsDateString()
+  startDate: string;
+
+  @IsDateString()
+  endDate: string;
+
+  @IsOptional()
+  @IsNumber()
+  dailyRate?: number;
+
+  @IsOptional()
+  @IsNumber()
+  totalAmount?: number;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
+
+export class UpdateRentalDto {
+  @IsOptional()
+  @IsInt()
+  classroomId?: number;
+
+  @IsOptional()
+  @IsInt()
+  tenantId?: number;
+
+  @IsOptional()
+  @IsDateString()
+  startDate?: string;
+
+  @IsOptional()
+  @IsDateString()
+  endDate?: string;
+
+  @IsOptional()
+  @IsNumber()
+  dailyRate?: number;
+
+  @IsOptional()
+  @IsNumber()
+  totalAmount?: number;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+
+  @IsOptional()
+  @IsEnum(['active', 'ended', 'cancelled'])
+  status?: string;
+}