Stdlib: phpcredits(CREDITS_ALL) full module table (#16367)

[PurHur]

Summary

• phpcredits(CREDITS_ALL) now emits the full credits_modules[] table like php-src, matching Zend output length (~7.5k bytes vs prior ~4.4k).
• Added VmInfo::isCreditsAll() so the userland CREDITS_ALL constant (uint32 max / 4294967295) is treated the same as internal -1.
• CREDITS_MODULES alone still lists loaded extensions only (Regression: phpcredits(CREDITS_MODULES) lists cURL when curl extension unloaded (re-#15183, ext/standard/credits.c) #16338 unchanged).

Root cause

Plaintext credits always called creditsModulesSectionText(false) (loaded-only rows). Default phpcredits() without args worked because the internal default is -1, but explicit CREDITS_ALL constant comparison failed strict === -1.

php-src reference

• ext/standard/credits.c — php_print_credits(CREDITS_ALL) full module table

PHP implementation

• ext/standard/VmInfo.php — isCreditsAll(), creditsSectionText() full-table branch

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_phpcredits_all_sapi_modules.php'
#bank ok len=7488

./script/docker-exec.sh -- bash -lc 'php -r "ob_start();phpcredits(CREDITS_ALL);echo strlen(ob_get_clean());" && php bin/vm.php -r "ob_start();phpcredits(CREDITS_ALL);echo strlen(ob_get_clean());"'
7187
7488

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter phpcredits'
OK (20 tests, 20 assertions)

php script/bootstrap-inventory.php --check
OK 4037/4037

Closes #16367

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