php-in-php: delete StringMultipartStandaloneLlvm — MultipartRuntime PHP bridge (#13031)

[PurHur]

Summary

Completes #13031 follow-up: user-script CGI superglobal refresh no longer links the ~1367-line StringMultipartStandaloneLlvm.php LLVM quarantine. Multipart POST populate routes through the existing MultipartRuntime → MultipartNativeJitHelper PHP bridge (same pattern as #15624 / #9394).

• Deleted: lib/JIT/Builtin/StringMultipartStandaloneLlvm.php (−1367 lines LLVM)
• Updated: SuperglobalRefreshUserScriptLlvm calls MultipartRuntime::ensureUserScriptLinked and __compiler_multipart_populate_post_body instead of __phpc_parse_multipart_post
• Spine: removed dead require from compiler_lib_spine_smoke/main.php

php-src reference

• main/rfc1867.c — multipart form parsing (semantics in lib/Web/MultipartParser.php + MultipartNativeJitHelper.php)

PHP implementation path

Layer	File
SSOT semantics	lib/Web/MultipartParser.php
User-script AOT native populate	lib/Web/MultipartNativeJitHelper.php
JIT/AOT link bridge	lib/JIT/Builtin/MultipartRuntime.php

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "MultipartRuntimeShrinkTest|SuperglobalRefreshRuntimeShrinkTest|SuperglobalsMultipartRuntimeStandaloneTest"'
# OK (9 tests, 35 assertions)

php script/bootstrap-inventory.php && php script/check-selfhost-spine-coverage-sync.php
# OK (4773 files, spine sync green)

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK build/selfhost-lib-spine-smoke

Closes #13031

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