Stdlib: DateTime @unix timestamp parse (#10858)

[PurHur]

Problem

Zend accepts unix-timestamp strings with an @ prefix for date_create('@0'), new DateTime('@0'), and DateTimeImmutable('@0'). VM failed to parse: date_create() warned and returned false; constructors threw misleading timezone errors.

php-src reference: ext/date/php_date.c — php_parse_date() @ unix timestamp branch

Fix

PHP-in-PHP in lib/VM/DateTimeSupport.php:

• Added tryParseAtUnixTimestampString() for @<int|float> suffix
• Wired into initDateTime() and tryNewDateTimeLikeVariable() (date_create() path)
• @ form sets timestamp directly with +00:00 timezone (Zend TIMELIB_ZONETYPE_OFFSET), ignoring default/ctor timezone

No new C runtime logic.

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/maintainer_gap_datetime_at_timestamp.php
php bin/vm.php test/repro/maintainer_gap_datetime_at_timestamp.php'
# OK / OK

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter datetime_at_timestamp test/compliance/VMTest.php'
# OK (1 test)

php script/bootstrap-inventory.php --check
# OK 4769/4769

Closes #10858

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