feat: add batch-import students to class endpoint

apps/server/src/classes/dto/class.dto.ts

@@ -1,4 +1,4 @@
-import { IsOptional, IsString, IsNotEmpty, IsInt, IsArray, IsDateString, IsEnum } from 'class-validator';
+import { IsOptional, IsString, IsNotEmpty, IsInt, IsArray, IsDateString, IsEnum, ArrayNotEmpty } from 'class-validator';
 import { Type } from 'class-transformer';
 import { ClassType, ClassStatus, TeacherRoleType } from '../../entities';
 
@@ -43,6 +43,11 @@ export class CreateClassDto {
   studentIds?: number[];
 
   @IsOptional() @IsArray()
+
+  @IsArray()
+  @IsString({ each: true })
+  @IsOptional()
+  dingUserIds?: string[];
   teachers?: Array<{ userId: number; roleType: string; subject?: string }>;
 }
 
@@ -135,3 +140,10 @@ export class QueryClassAttendanceSummaryDto {
   @IsOptional() @IsDateString()
   endDate?: string;
 }
+
+export class BatchImportStudentsDto {
+  @IsArray()
+  @IsString({ each: true })
+  @ArrayNotEmpty()
+  dingUserIds: string[];
+}