refactor: remove User-based import and RBAC UserDingMapping endpoints

apps/server/src/sync/dto/import-users.dto.ts

@@ -1,70 +0,0 @@
-import {
-  IsArray,
-  IsString,
-  IsNumber,
-  IsOptional,
-  ValidateNested,
-} from 'class-validator';
-import { Type } from 'class-transformer';
-
-export class ImportUserItemDto {
-  @IsString()
-  dingUserId: string;
-
-  @IsString()
-  name: string;
-
-  @IsString()
-  mobile: string;
-
-  @IsOptional()
-  @IsNumber()
-  roleId: number | null;
-
-  @IsArray()
-  @IsNumber({}, { each: true })
-  dingDeptIds: number[];
-}
-
-export class ImportClassItemDto {
-  @IsNumber()
-  deptId: number;
-
-  @IsString()
-  name: string;
-
-  @IsString()
-  code: string;
-
-  @IsString()
-  classType: string;
-
-  @IsOptional()
-  @IsString()
-  startDate?: string;
-
-  @IsOptional()
-  @IsString()
-  endDate?: string;
-
-  @IsOptional()
-  @IsNumber()
-  maxStudents?: number;
-
-  @IsOptional()
-  @IsString()
-  notes?: string;
-}
-
-export class ImportUsersDto {
-  @IsOptional()
-  @IsArray()
-  @ValidateNested({ each: true })
-  @Type(() => ImportClassItemDto)
-  classes?: ImportClassItemDto[];
-
-  @IsArray()
-  @ValidateNested({ each: true })
-  @Type(() => ImportUserItemDto)
-  users: ImportUserItemDto[];
-}