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/deposits/dto/deposit.dto.ts

@@ -0,0 +1,33 @@
+import { IsInt, IsNumber, IsString, IsOptional } from 'class-validator';
+
+export class CreateDepositDto {
+  @IsInt()
+  studentId: number;
+
+  @IsNumber()
+  amount: number;
+
+  @IsString()
+  paidDate: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
+
+export class RefundDepositDto {
+  @IsString()
+  refundDate: string;
+
+  @IsOptional()
+  @IsNumber()
+  deductionAmount?: number;
+
+  @IsOptional()
+  @IsString()
+  deductionReason?: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}