docs: update frontend deploy guide

README.md

@@ -83,7 +83,8 @@ ZMAIL consists of two parts that need to be deployed separately:
     </li>
     <li>Configure environment variables:
       <ul>
-        <li><code>API_BASE_URL</code>: Your Worker API base URL (e.g., <code>https://api.mdzz.uk</code>)</li>
+        <li><code>VITE_API_BASE_URL</code>: Your Worker API base URL (e.g., <code>https://api.mdzz.uk</code>)</li>
+         <li><code>VITE_EMAIL_DOMAIN</code>: Your Domain (e.g., <code>mdzz.uk</code>)</li>
       </ul>
     </li>
     <li>Click "Save and Deploy"</li>

README.zh-CN.md

@@ -83,7 +83,8 @@ ZMAIL 由前端和后端两部分组成，需要分别部署：
     </li>
     <li>配置环境变量:
       <ul>
-        <li><code>API_BASE_URL</code>: 您的Worker API基础URL (例如: <code>https://api.mdzz.uk</code>)</li>
+        <li><code>VITE_API_BASE_URL</code>: 您的Worker API基础URL (例如: <code>https://api.mdzz.uk</code>)</li>
+         <li><code>VITE_EMAIL_DOMAIN</code>: 您的域名 (例如: <code>mdzz.uk</code>)</li>
       </ul>
     </li>
     <li>点击"保存并部署"</li>