Polish generic NAS deployment template

- Rework docker-compose-Nas.yaml as a QNAP/NAS-friendly generic template with placeholders for NAS IP, public domain, proxy, and secrets.

- Preserve QNAP-specific fixes including relative build context, api network alias, NAS persistent paths, and 127.0.0.1 health checks.

- Keep optional frpc profile while avoiding real server addresses or tokens in the reusable template.

- Replace residual deployment examples with generic your-domain.example, NAS_IP, PROXY_IP, and LAN_CIDR placeholders in README and Docker docs.

docs/deployment.md

@@ -106,7 +106,7 @@ docker-compose up -d --build
 推荐链路：
 
 ```text
-浏览器 https://sstwbg.example.com
+浏览器 https://your-domain.example
   -> 公网服务器 Nginx Proxy Manager
   -> frps/frpc 映射端口
   -> 本机 Docker web:4002
@@ -127,7 +127,7 @@ docker-compose --profile frpc up -d --build
 docker-compose logs -f frpc
 ```
 
-Nginx Proxy Manager 代理 `sstwbg.example.com` 时：
+Nginx Proxy Manager 代理 `your-domain.example` 时：
 
 - 代理目标指向 frpc 暴露的 `4002` 映射端口。
 - 开启 `Websockets Support`，否则 `/api/speech/iat` 语音 WebSocket 会失败。