Fix ZipArchive addFromString AOT entry names (#35454)

[PurHur]

Summary

• AOT ZipArchive::addFromString() wrote zip entries named status/open_create (stale exec() $op strings) with empty payload instead of the requested filename/content.
• Route addFromString through a dedicated NestedJIT ZipArchiveJitHelper::addEntry(string $name, string $content) helper; keep exec() add branch as a delegate for VM/other callers.
• Register addEntry in ZipArchiveEmbedBridge and add minimal repro test/repro/zip_minimal_add_aot.php.

php-src: ext/zip/php_zip.c — zim_ZipArchive_addFromString

Test plan

export PHP_COMPILER_ENABLE_ZIP=1
./script/phpunit.sh --filter ZipArchiveMultiAddAotTest
# OK (2 tests, 8 assertions)

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

Closes #35454

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