[PurHur]

Summary

• Parse IPv6 literal authorities in bracket notation ([::1], [2001:db8::1]) as opaque host tokens.
• Extract :port only after the closing ], matching php-src ext/standard/url.c (php_url_parse_ex2).

Implementation: ext/standard/VmString.php::parseUrlAuthority() (JIT/AOT reuse VmString::parseUrl via JitParseUrl).

Verification

php test/repro/maintainer_gap_parse_url_ipv6_host.php
php bin/vm.php test/repro/maintainer_gap_parse_url_ipv6_host.php
# four ok:… lines

./script/docker-exec.sh -- bash -lc './vendor/bin/phpunit --filter parse_url_ipv6_host'
# OK (4 tests)

./script/docker-exec.sh -- bash -lc 'php bin/compile.php -l test/repro/maintainer_gap_parse_url_ipv6_host.php'
# AOT lint OK

Closes #13739

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