fix: restore PHP upload limits and OPcache tuning in the production image

[theRomanOak]

Problem

The FrankenPHP base image loads no php.ini at all — neither php.ini-production nor php.ini-development — so PHP's built-in defaults apply. Verifiable against the base image:

docker run --rm dunglas/frankenphp:1-php8.4 \
    php -r 'echo ini_get("upload_max_filesize"), " ", php_ini_loaded_file() ?: "none";'
# -> 2M none

The application accepts vehicle documents up to 25 MB (VehicleDocumentsRelationManager::MAX_FILE_SIZE_KB) and images up to 10 MB (VehicleForm::MAX_IMAGE_SIZE_KB). In the published image every upload above 2 MB fails — and it fails before reaching the application's own validation, with a message that does not name the size as the cause ("field is required" instead of a statement about size).

42f923d intended to fold these limits into the image when it removed docker/uploads-prod.ini and docker/opcache-prod.ini, but no ini settings made it into the Dockerfile.

Change

Both files return as a single docker/php-prod.ini, copied to /usr/local/etc/php/conf.d/zz-app-prod.ini. The zz- prefix makes it load last, so the OPcache values win over docker-php-ext-opcache.ini from the base image.

• Upload limits — upload_max_filesize=30M, post_max_size=32M (must exceed the file limit: it covers the whole form body, not just the file)
• OPcache — memory, file count and interned-strings buffer tuned. validate_timestamps deliberately stays at its default, so a new image always serves current code without an extra cache-busting step.
• display_errors=Off, expose_php=Off — Laravel switches display_errors off itself, but only once the framework is booted; an error before that (a missing extension, say) would otherwise reach the browser with paths and source lines.

CLAUDE.md documented docker/uploads-prod.ini as layer 1 of the three upload limits; that reference now points at the new file and explains why the setting is needed at all.

Verification

Values read out of the built image, not the source file:

Setting	Value
upload_max_filesize	30M
post_max_size	32M
opcache.memory_consumption	256
opcache.max_accelerated_files	20000
display_errors	off
expose_php	off

Full suite: 383 passed (1222 assertions). Pint clean.

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