feat: improve attendance scheduling and API validation

apps/server/src/deposits/dto/deposit.dto.ts

@@ -1,13 +1,14 @@
-import { IsInt, IsNumber, IsString, IsOptional } from 'class-validator';
+import { IsDateString, IsIn, IsInt, IsNumber, IsString, IsOptional, Min } from 'class-validator';
 
 export class CreateDepositDto {
   @IsInt()
   studentId: number;
 
-  @IsNumber()
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0.01)
   amount: number;
 
-  @IsString()
+  @IsDateString()
   paidDate: string;
 
   @IsOptional()
@@ -16,10 +17,29 @@ export class CreateDepositDto {
 }
 
 export class RefundDepositDto {
-  @IsString()
+  @IsDateString()
   refundDate: string;
 
   @IsOptional()
   @IsString()
   notes?: string;
 }
+
+export class CreateDepositInstallmentDto {
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0.01)
+  amount: number;
+
+  @IsDateString()
+  dueDate: string;
+}
+
+export class UpdateDepositInstallmentDto {
+  @IsOptional()
+  @IsDateString()
+  paidDate?: string;
+
+  @IsOptional()
+  @IsIn(['pending', 'paid', 'overdue'])
+  status?: string;
+}