fix: compilation error, missing import

src/admin/admin.controller.ts

 import { ApiOperation, ApiParam } from '@nestjs/swagger';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
-import { Body, Delete, Param, Controller, Get, Post, UseGuards, HttpStatus } from '@nestjs/common';
+import { Body, Delete, Param, Controller, Get, Post, UseGuards, HttpStatus, HttpException } from '@nestjs/common';
 import { NewsletterSubscription } from '../newsletter/newsletter-subscription.schema';
 import { NewsletterService } from '../newsletter/newsletter.service';
 import { StructuresService } from '../structures/services/structures.service';
@@ -8,7 +8,6 @@ import { Roles } from '../users/decorators/roles.decorator';
 import { RolesGuard } from '../users/guards/roles.guard';
 import { UsersService } from '../users/users.service';
 import { PendingStructureDto } from './dto/pending-structure.dto';
-import { UnclaimedStructureDto } from './dto/unclaimed-structure-dto';
 
 @Controller('admin')
 export class AdminController {