test: add wechat integration test suite

- Add llm/wechat-subsystem-test-matrix.md and tests covering Wx controllers/services\n- Make ApiTestDataSeeder personnel group seeding idempotent for full-suite stability

play-admin/src/test/java/com/starry/admin/api/WxCustomGiftOrderApiTest.java

@@ -79,7 +79,7 @@ class WxCustomGiftOrderApiTest extends WxCustomOrderApiTestSupport {
     @Test
     // 测试用例：用户余额充足且携带有效登录态时，请求 /wx/custom/order/gift 下单指定礼物，
     // 期望生成已完成的礼物奖励订单、产生对应收益记录，同时校验用户/陪玩师礼物计数与账户余额随订单金额同步更新。
-    void giftOrderCreatesCompletedRewardAndUpdatesGiftCounters() throws Exception {
+    void giftOrderCreatesCompletedRewardAndUpdatesGiftCounters__covers_CUS_005() throws Exception {
         SecurityUtils.setTenantId(ApiTestDataSeeder.DEFAULT_TENANT_ID);
         try {
             resetCustomerBalance();