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/tenant.go

@@ -26,6 +26,49 @@ import (
 // @provider
 type tenant struct{}
 
+// SuperDetail 查询单个租户详情（平台侧）。
+func (t *tenant) SuperDetail(ctx context.Context, tenantID int64) (*superdto.TenantItem, error) {
+	if tenantID <= 0 {
+		return nil, errors.New("tenant_id must be > 0")
+	}
+
+	tbl, query := models.TenantQuery.QueryContext(ctx)
+	m, err := query.Where(tbl.ID.Eq(tenantID)).First()
+	if err != nil {
+		return nil, err
+	}
+
+	userCountMapping, err := t.TenantUserCountMapping(ctx, []int64{m.ID})
+	if err != nil {
+		return nil, err
+	}
+	incomeMapping, err := t.TenantIncomePaidMapping(ctx, []int64{m.ID})
+	if err != nil {
+		return nil, err
+	}
+
+	item := &superdto.TenantItem{
+		Tenant:              m,
+		UserCount:           lo.ValueOr(userCountMapping, m.ID, 0),
+		IncomeAmountPaidSum: lo.ValueOr(incomeMapping, m.ID, 0),
+		StatusDescription:   m.Status.Description(),
+	}
+
+	ownerMapping, err := t.TenantOwnerUserMapping(ctx, []*models.Tenant{m})
+	if err != nil {
+		return nil, err
+	}
+	item.Owner = ownerMapping[m.ID]
+
+	adminMapping, err := t.TenantAdminUsersMapping(ctx, []int64{m.ID})
+	if err != nil {
+		return nil, err
+	}
+	item.AdminUsers = adminMapping[m.ID]
+
+	return item, nil
+}
+
 // SuperCreateTenant 超级管理员创建租户，并将指定用户设为租户管理员。
 func (t *tenant) SuperCreateTenant(ctx context.Context, form *superdto.TenantCreateForm) (*models.Tenant, error) {
 	if form == nil {