Add optional frpc deployment profile

- Add frpc/frpc.toml template for mapping the local Docker web entry on port 4002 to the public frps server.

- Add an optional Docker Compose frpc service behind the frpc profile, mounting the reusable frpc.toml configuration.

- Document how to enable the frpc profile, inspect frpc logs, and keep normal local startup unchanged.

- Clarify that public deployments should map only port 4002 and let Nginx Proxy Manager provide HTTPS for sstwbg.example.com instead of exposing 4443.

- Update Docker and deployment docs to match the reusable frpc workflow.

frpc/frpc.toml

@@ -0,0 +1,22 @@
+# XXX frpc template for exposing the local Docker web entry http://127.0.0.1:4002
+# XXX Replace serverAddr and auth.token before deploying; do not commit real production tokens.
+
+# 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 = "127.0.0.1"
+localPort = 4002
+remotePort = 4002