fix: reorganization of files and folders

src/api/dto/label.dto.ts

@@ -0,0 +1,12 @@
+export class LabelDto {
+  id?: string;
+  name: string;
+  color: number;
+  predefinedId?: string;
+}
+
+export class HandleLabelDto {
+  number: string;
+  labelId: string;
+  action: 'add' | 'remove';
+}