refactor(auth): 删除无用的 _scope_info 角色

- 删除创建 appAuth 时自动添加的 _scope_info 占位角色
- 删除对 _scope_info 的保留字检查
- 简化代码，避免在数据库中创建无用记录

auth/auth.go

@@ -109,12 +109,6 @@ func (f *authFactory) New(scope string) Auth {
 		policies:     make(map[string][][2]string),
 		roleInitDone: make(map[string]bool),
 	}
-	// 设置权限域信息
-	auth.roleDefs["_scope_info"] = roleDefinition{
-		code:        "_scope_info",
-		name:        scope,
-		description: scope + " scope",
-	}
 	f.apps[scope] = auth
 	return auth
 }
@@ -175,9 +169,6 @@ func (a *appAuth) AddRole(roleCode, roleName string, policies ...string) error {
 	if roleCode == "" || roleName == "" {
 		return fmt.Errorf("role code and name cannot be empty")
 	}
-	if roleCode == "_scope_info" {
-		return fmt.Errorf("reserved role code: _scope_info")
-	}
 
 	// 解析并验证权限格式
 	parsedPolicies := make([][2]string, 0, len(policies))