Make NAS frpc run in Container Station

- Add a NAS-specific frpc template that forwards to tuwen_web:80 over the compose network.

- Make docker-compose-Nas.yaml create tuwen_frpc by default instead of relying on Compose profiles, which Container Station may not enable.

- Remove host networking from the NAS frpc service so the tunnel works through Docker service DNS.

- Update README and Docker docs to explain the NAS frpc behavior and logs command.

frpc/frpc.nas.toml

@@ -0,0 +1,23 @@
+# XXX QNAP/NAS frpc template.
+# XXX Replace serverAddr and auth.token before deploying; do not commit real production tokens.
+# XXX This file is mounted by docker-compose-Nas.yaml. frpc connects to tuwen_web:80 inside Docker.
+
+# 基础连接配置
+serverAddr = "XX.XX.XX.XX"
+serverPort = 7000
+
+# 权限验证 - 必须与服务端一致
+auth.method = "token"
+auth.token = "XXX"
+
+# 传输配置优化
+transport.poolCount = 5
+transport.heartbeatTimeout = -1
+
+# --- 映射 图文系统访问端口 (TCP) ---
+[[proxies]]
+name = "TuWen_System_V2"
+type = "tcp"
+localIP = "tuwen_web"
+localPort = 80
+remotePort = 4002