add dto validation and swagger schemas

src/modules/bookings/dto/create-booking.dto.ts

@@ -1,8 +1,27 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsISO8601, IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+
 export class CreateBookingDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   customerId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessServiceId!: string;
+
   /** ISO 8601 datetime string */
+  @ApiProperty({ example: '2026-05-13T10:00:00.000Z' })
+  @IsISO8601()
   scheduledAt!: string;
+
+  @ApiPropertyOptional({ example: 'Test booking', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   note?: string | null;
 }

src/modules/bookings/dto/update-booking.dto.ts

@@ -1,7 +1,21 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsEnum, IsISO8601, IsOptional, IsString, MaxLength } from 'class-validator';
 import { BookingStatus } from '../../../entities/booking.entity';
 
 export class UpdateBookingDto {
+  @ApiPropertyOptional({ example: '2026-05-13T10:00:00.000Z' })
+  @IsOptional()
+  @IsISO8601()
   scheduledAt?: string;
+
+  @ApiPropertyOptional({ enum: BookingStatus, example: BookingStatus.CONFIRMED })
+  @IsOptional()
+  @IsEnum(BookingStatus)
   status?: BookingStatus;
+
+  @ApiPropertyOptional({ example: 'Customer asked for morning slot', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   note?: string | null;
 }