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

docker-compose.yml

@@ -3,41 +3,28 @@ services:
     build: .
     container_name: gravity-gateway
     restart: unless-stopped
-    # Port NOT exposed directly — Caddy handles external access
-    expose:
-      - "8585"
+    ports:
+      - "127.0.0.1:8585:8585"
+    env_file:
+      - .env
     environment:
-      - DISCORD_TOKEN=${DISCORD_TOKEN}
-      - DISCORD_GUILD_ID=${DISCORD_GUILD_ID}
       - BOT_MODE=gateway
       - GATEWAY_PORT=8585
-      - GATEWAY_API_KEY=${GATEWAY_API_KEY}
-      - GRAVITY_HUB_SECRET=${GRAVITY_HUB_SECRET}
-      - GRAVITY_REGISTRATION_CODE=${GRAVITY_REGISTRATION_CODE}
       - 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"
-
-  caddy:
-    image: caddy:2-alpine
-    container_name: gravity-caddy
-    restart: unless-stopped
-    ports:
-      - "443:443"
-      - "80:80"
-    volumes:
-      - ./Caddyfile:/etc/caddy/Caddyfile:ro
-      - caddy-data:/data
-      - caddy-config:/config
-    depends_on:
-      - gateway
+        max-size: 10m
+        max-file: 3
 
 volumes:
   gateway-data:
-  caddy-data:
-  caddy-config:
+
+networks:
+  proxy-net:
+    external: true