添加一个测试用响应

Change-Id: I2d7a9edfd5131b5e6cd364814647536d21d50254
diff --git a/src/main/java/com/pt/controller/CommentController.java b/src/main/java/com/pt/controller/CommentController.java
index a85d131..17dabb3 100644
--- a/src/main/java/com/pt/controller/CommentController.java
+++ b/src/main/java/com/pt/controller/CommentController.java
@@ -72,7 +72,9 @@
 
         List<Comment> comments = commentService.getCommentsByPostId(postId);
         ans.put("result", "Comments retrieved successfully");
-        ans.put("comments", comments);
+        ans.put("data", Map.of(
+           "comments", comments
+        ));
         return ResponseEntity.ok(ans);
     }
 }