feat: 添加租户创建功能，支持设置管理员及有效期，新增订单统计接口

frontend/superadmin/src/service/OrderService.js

@@ -0,0 +1,8 @@
+import { requestJson } from './apiClient';
+
+export const OrderService = {
+    async getOrderStatistics() {
+        return requestJson('/super/v1/orders/statistics');
+    }
+};
+

frontend/superadmin/src/service/TenantService.js

@@ -22,6 +22,17 @@ export const TenantService = {
             items: normalizeItems(data?.items)
         };
     },
+    async createTenant({ code, name, admin_user_id, duration } = {}) {
+        return requestJson('/super/v1/tenants', {
+            method: 'POST',
+            body: {
+                code,
+                name,
+                admin_user_id,
+                duration
+            }
+        });
+    },
     async renewTenantExpire({ tenantID, duration }) {
         return requestJson(`/super/v1/tenants/${tenantID}`, {
             method: 'PATCH',