fix(docker): entrypoint chowns storage at container start

Stale app.log owned by UID 82 (from previous image) blocked the UID-1000 php-fpm workers from writing. Entrypoint fixes ownership on every start, surviving migrations.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker/php/entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+
+mkdir -p /var/www/html/storage/logs /var/www/html/storage/uploads
+chown -R www-data:www-data /var/www/html/storage
+
+exec docker-php-entrypoint "$@"