perf(chat): 分页客服会话并拆分统计查询

backend/internal/modules/chat/participant.go

@@ -45,9 +45,9 @@ func (r *Repository) conversationQuery(ctx context.Context, principal Principal)
 				SELECT COUNT(1)
 				FROM chat_messages AS cm
 				WHERE cm.conversation_id = c.id
-				  AND cm.sender_type <> 'system'
-				  AND NOT (cm.sender_type = ? AND cm.sender_id = ?)
-				  AND (cp.last_read_at IS NULL OR cm.created_at > cp.last_read_at)
+					AND cm.sender_type <> 'system'
+					AND NOT (cm.sender_type = ? AND cm.sender_id = ?)
+					AND (cp.last_read_at IS NULL OR cm.created_at > cp.last_read_at)
 			) AS unread_count`, principal.Type, principal.ID).
 		Joins("JOIN chat_participants AS cp ON cp.conversation_id = c.id").
 		Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
@@ -184,11 +184,12 @@ func (r *Repository) toMessageDTOs(ctx context.Context, principal Principal, row
 			SenderAvatar:   avatar,
 			IsSelf:         isSelf,
 			// 仅对自己发出的消息计算已读：是否已被所有其他参与者读取。
-			IsRead:         isSelf && messageReadByOthers(readParticipants[row.ConversationID], row),
-			ContentType:    row.ContentType,
-			Content:        row.Content,
-			AttachmentURLS: decodeStringList(row.AttachmentURLS),
-			CreatedAt:      row.CreatedAt,
+			IsRead:             isSelf && messageReadByOthers(readParticipants[row.ConversationID], row),
+			ContentType:        row.ContentType,
+			Content:            row.Content,
+			AttachmentURLS:     decodeStringList(row.AttachmentURLS),
+			AdminAttentionType: row.AdminAttentionType,
+			CreatedAt:          row.CreatedAt,
 		})
 	}
 	return items, nil