Fix stream_get_meta_data() php://temp stream_type TEMP (#16577)

[PurHur]

Summary

• Distinguish php://temp from php://memory in VmStreamMeta::phpNativeStreamType() so stream_get_meta_data()['stream_type'] returns 'TEMP' per php-src (main/streams/php_stream_temp.c).
• PHP implementation in ext/standard/VmStreamMeta.php — no C runtime changes.

Closes #16577

php-src reference

• ext/standard/streams.c — PHP_FUNCTION(stream_get_meta_data)
• main/streams/php_stream_temp.c — temp wrapper stream_type label

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_stream_get_meta_data_temp_type.php'
# ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter VmStreamMetaRuntimeShrinkTest test/unit/VmStreamMetaRuntimeShrinkTest.php'
# OK (8 tests, 31 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "stream_get_meta_data_temp" test/compliance/'
# OK (3 tests, 3 assertions)

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