fix(coolify): switch PHP-FPM from ondemand to dynamic mode

ondemand kills all workers after 10s idle, causing cold Laravel
bootstrap (10-54s) on every request after any quiet period.
dynamic keeps min_spare_servers=1 alive at all times; the other
PM_* values (start_servers=2, min=1, max_spare=3) were already
set but ignored under ondemand.

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

coolify/compose.yml

@@ -23,6 +23,7 @@ services:
       PUSHER_APP_SECRET: ${PUSHER_APP_SECRET}
       PUSHER_SCHEME: https
       SSL_MODE: "off"
+      PHP_FPM_PM_CONTROL: dynamic
     volumes:
       - ../.data/coolify/data:/data/coolify
       - /var/run/docker.sock:/var/run/docker.sock