fix(entrypoint): graceful docker stop + cac-fpm error_log owner on first start

Graceful stop (cac, cac-fpm, shared-httpd, and form-sender which runs cac):
entrypoint.sh, entrypoint-fpm.sh and entrypoint-shared-httpd.sh end with bash
as PID 1 tailing logs. PID 1 only receives signals it has a handler for, so
docker stop's SIGTERM was dropped; docker waited the full 10s and SIGKILLed
apache / php-fpm mid-request (exit 137). The entrypoints now trap TERM/INT and
stop each daemon they started via the new scripts/stop-services.sh: httpd
graceful-stop (WINCH), php-fpm QUIT, crond TERM, each with a bounded wait and a
TERM/KILL fallback, budgets summing to < 10s, then exit 0. The log tail is
backgrounded + `wait`ed (and shared-httpd's 60s rescan sleep likewise) so the
trap runs immediately. Log streaming to docker logs is unchanged.

cac-fpm error_log: entrypoint-fpm.sh `touch`ed logs/php-fpm/error.log as root
AFTER its chown -R, so on a site's first start the pool (customer uid) could
not open it and PHP errors went out as FastCGI stderr to shared-httpd's log
until the next restart. The file is now created and chowned to the customer
right after the logs dir is made, before php-fpm starts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile.shared-httpd

@@ -13,6 +13,7 @@ COPY ./scripts/detect-memory.sh /scripts/detect-memory.sh
 COPY ./scripts/create-apache-mpm-config.sh /scripts/create-apache-mpm-config.sh
 COPY ./scripts/log-rotate.sh /scripts/log-rotate.sh
 COPY ./scripts/entrypoint-shared-httpd.sh /scripts/entrypoint-shared-httpd.sh
+COPY ./scripts/stop-services.sh /scripts/stop-services.sh
 COPY ./scripts/tune-mpm.sh /scripts/tune-mpm.sh
 RUN chmod +x /scripts/*