feat: reorder Security decorator in announcements controller for consistency.

Backend/src/controllers/announcementsController.ts

@@ -26,10 +26,10 @@ export class AnnouncementsController {
      * @param limit - จำนวนต่อหน้า / Items per page
      */
     @Get()
-    @Security('jwt')
     @SuccessResponse('200', 'Announcements retrieved successfully')
     @Response('401', 'Unauthorized')
     @Response('403', 'Forbidden')
+    @Security('jwt')
     public async listAnnouncements(
         @Request() request: any,
         @Path() courseId: number,