feat: Traefik에 webhook 프록시 추가 및 cron 폴링 제거

- Traefik file provider로 호스트 webhook(9000) 프록시
- /deploy 경로로 Gitea webhook 수신
- extra_hosts로 Linux host.docker.internal 지원
- 불필요한 Docker webhook 서비스 제거

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy/traefik/dynamic.yml

@@ -0,0 +1,13 @@
+http:
+  routers:
+    webhook:
+      rule: "PathPrefix(`/deploy`)"
+      entryPoints:
+        - web
+      service: webhook
+
+  services:
+    webhook:
+      loadBalancer:
+        servers:
+          - url: "http://host.docker.internal:9000"

deploy/traefik/traefik.yml

@@ -10,6 +10,9 @@ entryPoints:
 providers:
   docker:
     exposedByDefault: false
+  file:
+    filename: /etc/traefik/dynamic.yml
+    watch: true
 
 # 도메인 준비되면 주석 해제
 # certificatesResolvers:

docker-compose.prod.yml

@@ -36,9 +36,12 @@ services:
     ports:
       - "80:80"
       - "443:443"
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
       - ./deploy/traefik/traefik.yml:/etc/traefik/traefik.yml:ro
+      - ./deploy/traefik/dynamic.yml:/etc/traefik/dynamic.yml:ro
       - traefik_letsencrypt:/letsencrypt
     depends_on:
       - web