Refactor ListRules method to return structured response for rule groups

- Introduce a new response structure to encapsulate rule group items
- Map existing rules to the new response format, including category details
- Ensure consistent response format for improved API usability

internal/controller/waf.go

@@ -156,7 +156,20 @@ func (c *WafController) ListRules(ctx *gin.Context) {
 		utils.AssembleResponse(ctx, nil, err)
 		return
 	}
-	utils.AssembleResponse(ctx, rules, nil)
+	type resp struct {
+		Items []service.RuleGroupResp `json:"items"`
+	}
+	items := []service.RuleGroupResp{}
+	for _, rule := range rules {
+		items = append(items, service.RuleGroupResp{
+			CategoryID:  rule.CategoryID,
+			Status:      rule.Status,
+			Category:    rule.Category,
+			Description: rule.Description,
+		})
+	}
+
+	utils.AssembleResponse(ctx, resp{Items: items}, nil)
 }
 
 func (c *WafController) SaveRuleCategoryToDB(ctx *gin.Context) {