fix(mcp): resolve panic on nil tags argument in toolAddService

handlers/mcp.go

@@ -379,6 +379,13 @@ func toolAddService(args map[string]interface{}) (interface{}, error) {
 		}, nil
 	}
 
+	tagsStr := ""
+	if rawTags, ok := args["tags"]; ok && rawTags != nil {
+		if arr, ok := rawTags.([]interface{}); ok {
+			tagsStr = tagsToString(arr)
+		}
+	}
+
 	svc := models.Service{
 		Name:               strings.TrimSpace(name),
 		URL:                url,
@@ -386,22 +393,11 @@ func toolAddService(args map[string]interface{}) (interface{}, error) {
 		Icon:               icon,
 		CategoryID:         categoryID,
 		Status:             "unknown",
-		Tags:               tagsToString(args["tags"].([]interface{})),
+		Tags:               tagsStr,
 		IsEnabled:          isEnabled,
 		HealthCheckURL:     strings.TrimSpace(healthURL),
 		HealthCheckEnabled: healthEnabled,
 	}
-	// tags 需要单独处理（args["tags"] 可能不存在）
-	if rawTags, ok := args["tags"]; ok {
-		if arr, ok := rawTags.([]interface{}); ok {
-			svc.Tags = tagsToString(arr)
-		}
-	}
-	if svc.Tags == "" {
-		if arr, ok := args["tags"].([]interface{}); ok {
-			svc.Tags = tagsToString(arr)
-		}
-	}
 
 	if err := database.DB.Create(&svc).Error; err != nil {
 		return nil, fmt.Errorf("创建失败: %v", err)