fix:Fix the issue of nginx address occupation during the process of obtaining ssl certificates using certbot

docs/DEPLOYMENT.md

@@ -117,14 +117,16 @@ In production, Nginx will act as the entry point for all traffic, handling SSL t
       ```
       Then, edit `frontend/.env.production` to set `NEXT_PUBLIC_API_URL` to your backend service domain (e.g., `https://privydrop.app`).
 
-2.  **Install Nginx:** It's recommended to install a newer version that supports HTTP/3.
+2.  **Install Nginx:**
+    ```bash
+    sudo apt install -y nginx
+    ```
 
 3.  **Firewall:**
     Open 'Nginx Full' default ports and 443/udp:
 
     ```bash
         sudo ufw allow 'Nginx Full'
-        sudo ufw allow 443/udp
         sudo ufw reload # or ufw enable
     ```
 

docs/DEPLOYMENT.zh-CN.md

@@ -117,14 +117,15 @@ cd backend && npm run build && cd ..
       ```
       然后编辑 `frontend/.env.production`，配置 `NEXT_PUBLIC_API_URL` 为您的后端服务域名 (例如 `https://privydrop.app`)。
 
-2.  **安装 Nginx:** 推荐安装支持 HTTP/3 的较新版本。
-
+2.  **安装 Nginx:**
+    ```bash
+    sudo apt install -y nginx
+    ```
 3.  **防火墙:**
     打开'Nginx Full'默认端口以及 443/udp
 
     ```bash
         sudo ufw allow 'Nginx Full'
-        sudo ufw allow 443/udp
         sudo ufw reload # 或 ufw enable
     ```