fix: restore tenant filter on search reset in IM pages

BasicForm resetFields clears tenantId along with other fields, so the
auto-query after reset hit the empty-list guard (or was rejected by the
backend). Add a shared imSearchReset handler in imTenantOptions.ts that
refills the tenant select with its first option (bound users keep their
own tenant) before reloading, and wire it into the 9 IM list pages whose
reset did not already refill the tenant condition.

web/src/views/imUserPolicyGroup/index.vue

@@ -6,7 +6,7 @@
         ref="searchFormRef"
         @register="register"
         @submit="reloadTable"
-        @reset="reloadTable"
+        @reset="onSearchReset"
         @keyup.enter="reloadTable"
       />
       <n-alert type="info" :show-icon="true" class="whitelist-summary">
@@ -241,6 +241,7 @@
     parseJSON,
     policyTenantOptions,
   } from '@/views/imPolicyShared';
+  import { imSearchReset } from '../imTenantOptions';
 
   const dict = useDictStore(),
     message = useMessage(),
@@ -298,6 +299,11 @@
     actionRef.value?.reload();
     refreshLoginIPSummary();
   };
+  // 重置后回填商户下拉再查询；回填跳过「全局默认」(value=0)，与初始加载 getDefaultTenantValue 行为一致
+  const resetTenantOptions = computed(() =>
+    policyTenantOptions.value.filter((v) => Number(v.value) > 0)
+  );
+  const onSearchReset = imSearchReset(searchFormRef, resetTenantOptions, reloadTable);
   const actionColumn = reactive({
     width: 300,
     title: '操作',