fix: accept any HTTP response in Caddy health check

On fresh servers with no apps, Caddy returns 404 which caused a false
positive failure. Check that Caddy returns any valid HTTP status code
instead of requiring 2xx.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: baijum

infrastructure/verify-server.sh

@@ -136,7 +136,7 @@ else
   fail "MinIO health endpoint is not responding"
 fi
 
-if curl -sf -o /dev/null http://localhost:80; then
+if curl -s -o /dev/null -w '%{http_code}' http://localhost:80 | grep -qE '^[0-9]+$'; then
   pass "Caddy is responding on port 80"
 else
   fail "Caddy is not responding on port 80"