refactor(api): Remove roles field from user info response

- Remove Roles field from UserInfoWithPerms struct
    - Remove roles query logic from me endpoint
    - Clean up unused UserRole model import usage

api/auth/me.go

@@ -29,7 +29,6 @@ type UserInfoWithPerms struct {
 	Phone       *string              `json:"phone"`
 	Avatar      string               `json:"avatar"`
 	Permissions []UserPermissionInfo `json:"permissions"`
-	Roles       []string             `json:"roles"`
 }
 
 // me 获取当前用户信息
@@ -59,13 +58,6 @@ func me(x *vigo.X) (*UserInfoWithPerms, error) {
 		})
 	}
 
-	// 获取用户角色 (通过 UserRole 关联表)
-	roles := make([]string, 0)
-	cfg.DB().Model(&models.UserRole{}).
-		Joins("JOIN roles ON user_roles.role_id = roles.id").
-		Where("user_roles.user_id = ?", userID).
-		Pluck("roles.code", &roles)
-
 	return &UserInfoWithPerms{
 		ID:          user.ID,
 		Username:    user.Username,
@@ -74,7 +66,6 @@ func me(x *vigo.X) (*UserInfoWithPerms, error) {
 		Phone:       user.Phone,
 		Avatar:      user.Avatar,
 		Permissions: userPerms,
-		Roles:       roles,
 	}, nil
 }