fix: localize API error messages

frontend/app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue

@@ -494,7 +494,7 @@ export default {
         const response = await InboxHealthAPI.getHealthStatus(this.inbox.id);
         this.healthData = response.data;
       } catch (error) {
-        this.healthError = error.message || 'Failed to fetch health data';
+        this.healthError = error.message || '无法获取健康状态，请稍后再试。';
       } finally {
         this.isLoadingHealth = false;
       }

frontend/app/javascript/dashboard/routes/dashboard/settings/integrations/Shopify.vue

@@ -61,7 +61,7 @@ const handleStoreUrlSubmit = async () => {
     storeUrlError.value = '';
     if (!validateStoreUrl(storeUrl.value)) {
       storeUrlError.value =
-        'Please enter a valid Shopify store URL (e.g., your-store.myshopify.com)';
+        '请输入有效的 Shopify 店铺网址（例如：your-store.myshopify.com）';
       return;
     }