Add TODO comment for future file deletion implementation

A TODO comment was added to the files.service.ts to indicate the need for a file deletion feature. This serves as a placeholder for future development to ensure the feature is addressed.

apps/backend/src/app/files/files.service.ts

@@ -67,6 +67,8 @@ export class FilesService {
 		});
 	}
 
+	//TODO DELETE FILE
+
 	/**
 	 * Searches for files in the database using the specified search field, limit, and offset.
 	 *