feat: 添加用户统计功能，包括统计接口和相关数据结构

backend/app/http/super/dto/user.go

@@ -11,6 +11,7 @@ type UserPageFilter struct {
 	requests.SortQueryFilter
 
 	Username *string `query:"username"`
+	Status   *string `query:"status"`
 	TenantID *int64  `query:"tenant_id"`
 }
 
@@ -23,3 +24,9 @@ type UserItem struct {
 type UserStatusUpdateForm struct {
 	Status consts.UserStatus `json:"status" validate:"required,oneof=normal disabled"`
 }
+
+type UserStatistics struct {
+	Status            consts.UserStatus `json:"status"`
+	StatusDescription string            `json:"status_description"`
+	Count             int64             `json:"count"`
+}