fix(infra): docker-compose.yml 서버 실제 구성 반영 + Caddyfile 제거

docker-compose_server.yml

@@ -0,0 +1,30 @@
+services:
+  gateway:
+    build: .
+    container_name: gravity-gateway
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8585:8585"
+    env_file:
+      - .env
+    environment:
+      - BOT_MODE=gateway
+      - GATEWAY_PORT=8585
+      - BRAIN_PATH=/app/data/brain
+    volumes:
+      - gateway-data:/app/data
+    networks:
+      - default
+      - proxy-net
+    logging:
+      driver: json-file
+      options:
+        max-size: 10m
+        max-file: 3
+
+volumes:
+  gateway-data:
+
+networks:
+  proxy-net:
+    external: true