fix: optimize role code validator to avoid sql injects

Author: suyuan32

api/desc/core/role.api

@@ -15,7 +15,7 @@ type (
         Name *string `json:"name,optional" validate:"omitempty,max=30"`
 
         // Role code | 角色码
-        Code *string `json:"code,optional" validate:"omitempty,max=20"`
+        Code *string `json:"code,optional" validate:"omitempty,max=15,alphanum"`
 
         // DefaultRouter | 默认首页
         DefaultRouter *string `json:"defaultRouter,optional" validate:"omitempty,max=80"`

api/internal/handler/routes.go

@@ -6128,7 +6128,7 @@
         "code": {
           "description": "Role code | 角色码",
           "type": "string",
-          "maxLength": 20,
+          "maxLength": 15,
           "x-go-name": "Code"
         },
         "createdAt": {