feat: 添加 Let's Encrypt SSL 证书管理

- 新增独立 certbot 服务项目
- nginx 配置添加 HTTPS 8443 端口监听
- frpc.toml HTTPS 代理指向 nginx:8443
- 支持自动续签并重载 nginx
- 共享 Docker volume 传递证书

certbot/docker-compose.yml

@@ -0,0 +1,24 @@
+services:
+  certbot:
+    build: .
+    container_name: certbot
+    restart: unless-stopped
+    volumes:
+      - certbot-webroot:/var/www/certbot
+      - certbot-certs:/etc/letsencrypt
+      - certbot-logs:/var/log/letsencrypt
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+    networks:
+      - trim-default
+
+volumes:
+  certbot-webroot:
+    driver: local
+  certbot-certs:
+    driver: local
+  certbot-logs:
+    driver: local
+
+networks:
+  trim-default:
+    external: true