feat: add TenantDetail and UserDetail views with comprehensive functionality

- Implemented TenantDetail.vue to display tenant information, manage tenant status, and handle tenant renewals.
- Added user management features in UserDetail.vue, including user status updates and role management.
- Integrated data loading for tenant users and orders in TenantDetail.vue.
- Included search and pagination functionalities for owned and joined tenants in UserDetail.vue.
- Enhanced user experience with toast notifications for success and error messages.

backend/app/services/user.go

@@ -41,6 +41,42 @@ func (t *user) FindByUsername(ctx context.Context, username string) (*models.Use
 	return model, nil
 }
 
+// Detail 查询用户详情（超级管理员侧，返回脱敏后的 DTO）。
+func (t *user) Detail(ctx context.Context, userID int64) (*dto.UserItem, error) {
+	if userID <= 0 {
+		return nil, errors.New("user_id must be > 0")
+	}
+
+	model, err := t.FindByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	ownedTenantCounts, err := t.UserOwnedTenantCountMapping(ctx, []int64{model.ID})
+	if err != nil {
+		return nil, err
+	}
+	joinedTenantCounts, err := t.UserJoinedTenantCountMapping(ctx, []int64{model.ID})
+	if err != nil {
+		return nil, err
+	}
+
+	return &dto.UserItem{
+		ID:                model.ID,
+		Username:          model.Username,
+		Roles:             model.Roles,
+		Status:            model.Status,
+		StatusDescription: model.Status.Description(),
+		Balance:           model.Balance,
+		BalanceFrozen:     model.BalanceFrozen,
+		VerifiedAt:        model.VerifiedAt,
+		CreatedAt:         model.CreatedAt,
+		UpdatedAt:         model.UpdatedAt,
+		OwnedTenantCount:  ownedTenantCounts[model.ID],
+		JoinedTenantCount: joinedTenantCounts[model.ID],
+	}, nil
+}
+
 func (t *user) Create(ctx context.Context, user *models.User) (*models.User, error) {
 	if err := user.Create(ctx); err != nil {
 		return nil, errors.Wrapf(err, "Create user failed, %s", user.Username)