feat: 统一IM后台商户文案和默认选择

web/src/views/imWorkbench/index.vue

@@ -283,7 +283,7 @@
       if (tenantOptions.value.length > 0) {
         await setFieldsValue({ tenantId: tenantOptions.value[0].value });
       } else {
-        message.warning('暂无可用租户');
+        message.warning('暂无可用商户');
       }
     }
     reloadTable();

web/src/views/imWorkbench/model.ts

@@ -40,11 +40,11 @@ export const schemas = ref<FormSchema[]>([
   {
     field: 'tenantId',
     component: 'NSelect',
-    label: '租户',
+    label: '商户',
     componentProps: {
       clearable: false,
       options: computed(() => tenantOptions.value),
-      placeholder: '请选择租户',
+      placeholder: '请选择商户',
     },
   },
   {