Rebuild vpn proxy around gateway mode

docker-compose.gateway.yml

@@ -0,0 +1,24 @@
+services:
+  vpn-proxy-gateway:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: vpn-proxy-gateway
+    network_mode: host
+    cap_add:
+      - NET_ADMIN
+      - NET_RAW
+    env_file:
+      - .env
+    environment:
+      DATA_DIR: /var/lib/vpn-proxy
+      SING_BOX_CONFIG: /etc/sing-box/config.json
+      SING_BOX_CACHE: /var/lib/sing-box/cache.db
+    volumes:
+      - vpn-proxy-data:/var/lib/vpn-proxy
+      - sing-box-cache:/var/lib/sing-box
+    restart: unless-stopped
+
+volumes:
+  vpn-proxy-data:
+  sing-box-cache: