perf(dashboard): delete unused code

internal/chatlog/http/route.go

@@ -562,18 +562,10 @@ func (s *Service) handleDashboard(c *gin.Context) {
 		Links  int64 `json:"links"`
 		Others int64 `json:"others"`
 	}
-	type HourlyActivity struct {
-		Group  string         `json:"group"`
-		Name   string         `json:"name"`
-		Total  int64          `json:"total_messages"`
-		Series []HourlySeries `json:"series"`
-	}
 	type GroupAnalysis struct {
-		Title           string           `json:"title"`
-		Overview        GroupOverview    `json:"overview"`
-		ContentAnalysis ContentAnalysis  `json:"content_analysis"`
-		GroupList       []OverviewGroup  `json:"group_list"`
-		HourlyActivity  []HourlyActivity `json:"hourly_activity"`
+		Title           string          `json:"title"`
+		Overview        GroupOverview   `json:"overview"`
+		ContentAnalysis ContentAnalysis `json:"content_analysis"`
 	}
 	type ContentTypeStats struct {
 		Count      int64   `json:"count"`
@@ -638,47 +630,6 @@ func (s *Service) handleDashboard(c *gin.Context) {
 			Sunday:    heat[h][0],
 		})
 	}
-	// hourly activity typed（每个群独立统计）
-	type groupHourlyAgg struct {
-		id    string
-		name  string
-		total int64
-		hours [24]int64
-	}
-	ghagg := make([]groupHourlyAgg, 0, len(groupHourlyRaw))
-	for gid, arr := range groupHourlyRaw {
-		var total int64
-		for _, v := range arr {
-			total += v
-		}
-		// 如果全天无消息则跳过
-		if total == 0 {
-			continue
-		}
-		name := groupNameMap[gid]
-		if strings.TrimSpace(name) == "" {
-			name = gid
-		}
-		ghagg = append(ghagg, groupHourlyAgg{id: gid, name: name, total: total, hours: arr})
-	}
-	sort.Slice(ghagg, func(i, j int) bool {
-		if ghagg[i].total == ghagg[j].total {
-			return ghagg[i].name < ghagg[j].name
-		}
-		return ghagg[i].total > ghagg[j].total
-	})
-	hacts := make([]HourlyActivity, 0, len(ghagg))
-	for _, item := range ghagg {
-		series := make([]HourlySeries, 0, 24)
-		for h := 0; h < 24; h++ {
-			if item.hours[h] == 0 {
-				continue
-			}
-			series = append(series, HourlySeries{Hour: fmt.Sprintf("%02d:00", h), Messages: item.hours[h]})
-		}
-		hacts = append(hacts, HourlyActivity{Group: item.id, Name: item.name, Total: item.total, Series: series})
-	}
-
 	// ====== 今日群聊消息数统计 ======
 	todayMessages := int64(0)
 	if s.db != nil && s.db.GetDB() != nil {
@@ -882,8 +833,6 @@ func (s *Service) handleDashboard(c *gin.Context) {
 			Overview: GroupOverview{TotalGroups: len(overviewGroups), ActiveGroups: activeGroups, TodayMessages: int(todayMessages), WeeklyAvg: weeklyAvg, MostActiveHour: mostActiveHour},
 			// 扩展：增加 links 字段（结构体需更新）
 			ContentAnalysis: ContentAnalysis{Text: msgTypes["文本消息"], Images: msgTypes["图片消息"], Voice: msgTypes["语音消息"], Files: msgTypes["文件消息"], Links: msgTypes["链接消息"], Others: totalMsgs - (msgTypes["文本消息"] + msgTypes["图片消息"] + msgTypes["语音消息"] + msgTypes["文件消息"] + msgTypes["链接消息"])},
-			GroupList:       ogroups,
-			HourlyActivity:  hacts,
 		},
 		DataTypeAnalysis: DataTypeAnalysis{
 			Title: "数据类型统计",