Add @nestjs/serve-static dependency and update file paths for banner uploads; remove unused form utility files

src/main.ts

@@ -3,9 +3,11 @@ import { AppModule } from './app.module';
 import { ValidationPipe } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
+import { NestExpressApplication } from '@nestjs/platform-express';
+import { join } from 'path';
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
+  const app = await NestFactory.create<NestExpressApplication>(AppModule);
   const configService = app.get(ConfigService);
 
   // Configuración de validación global
@@ -17,6 +19,11 @@ async function bootstrap() {
     }),
   );
 
+  app.useStaticAssets(join(__dirname, '..', 'uploads'), {
+    index: false,
+    prefix: '/',
+  });
+
   // CORS configuration
   app.enableCors({
     origin: '*',