Switch to official php:8.5.8-fpm-trixie image, fix extension/FPM build issues
Rebuild on the official PHP image instead of Sury's repo on bare Debian. Fixes surfaced along the way: missing pkg-config/libonig-dev broke the zip/mbstring extension builds, purging libzip-dev also auto-removed the libzip5 runtime lib the compiled zip.so needs, phpredis needed bumping to 6.3.0 for PHP 8.5 header compatibility, and the php-fpm.conf listen directive sed didn't match the commented-out default line so FPM never created its unix socket, causing 503s from Apache's proxy_fcgi handler. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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