Fix health check to use IPv4 address

- Change health check from localhost to 127.0.0.1
- Fixes connection refused error (localhost resolves to IPv6)
- Both Dockerfile and docker-compose.yml updated

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -11,7 +11,7 @@ services:
       - "8880:80"
     restart: unless-stopped
     healthcheck:
-      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost/"]
+      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://127.0.0.1/"]
       interval: 30s
       timeout: 3s
       retries: 3