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/imTenantOptions.ts

@@ -71,6 +71,31 @@ export function lockTenantSchema(schema?: FormSchema) {
   props.clearable = false;
 }
 
+interface ImSearchFormRef {
+  setFieldsValue: (values: Record<string, any>) => Promise<void>;
+}
+
+/**
+ * 统一搜索重置回调：BasicForm 的 resetFields 会把包括 tenantId 在内的全部搜索字段清空，
+ * 随后的自动查询因缺商户条件命中前端空列表 guard（或被后端以「请选择IM租户」拒绝）。
+ * 此工厂返回的回调在 reset 之后把商户下拉回填为当前选项列表的第一项
+ * （商户绑定账号=自己商户；平台账号=全部商户列表第一项），再触发查询——
+ * 与各页面初始加载（onMounted 默认选中第一项）的行为保持一致。
+ */
+export function imSearchReset(
+  searchFormRef: Ref<ImSearchFormRef | null>,
+  tenantOptions: Ref<ImTenantOption[]>,
+  reload: () => unknown,
+) {
+  return async () => {
+    const first = Number(tenantOptions.value[0]?.value || 0);
+    if (first > 0) {
+      await searchFormRef.value?.setFieldsValue({ tenantId: first });
+    }
+    await reload();
+  };
+}
+
 function toTenantOption(item: any): ImTenantOption {
   return {
     label: formatImTenantLabel(item),