feat(feed_detail): add loadAllComments parameter to GetFeedDetail functionality

- Enhanced GetFeedDetail method to support loading all comments based on the new loadAllComments parameter.
- Updated related handlers and request structures to accommodate the new parameter.
- Improved logging to reflect the loading of all comments during feed detail retrieval.
- Implemented JavaScript logic to scroll and collect comments when loadAllComments is true.

handlers_api.go

@@ -165,7 +165,7 @@ func (s *AppServer) getFeedDetailHandler(c *gin.Context) {
 	}
 
 	// 获取 Feed 详情
-	result, err := s.xiaohongshuService.GetFeedDetail(c.Request.Context(), req.FeedID, req.XsecToken)
+	result, err := s.xiaohongshuService.GetFeedDetail(c.Request.Context(), req.FeedID, req.XsecToken, req.LoadAllComments)
 	if err != nil {
 		respondError(c, http.StatusInternalServerError, "GET_FEED_DETAIL_FAILED",
 			"获取Feed详情失败", err.Error())