Stdlib: gettext family Zend stub names and named args (#24375)

[PurHur]

Summary

• Map gettext/_/ngettext/dgettext/dcgettext/dngettext/dcngettext/bindtextdomain through BuiltinParamNames to php-src ext/gettext/gettext.stub.php (message, singular/plural/count, domain/directory) so Reflection and named args match Zend.
• InternalArgInfo still used catalog names (msgid, domain_name, dir); Zend named message: was Unknown named parameter, and VM also rejected its own msgid:.
• PHP-in-PHP only (lib/BuiltinParamNames.php); no new runtime/ C.

Closes #24375

php-src: ext/gettext/gettext.stub.php

Test plan

• VM repro
• JIT repro
• ./script/phpunit.sh --filter testGettextFamilyZendStubNamedParams
• ./script/phpunit.sh --filter GettextNamedParams24375 (VM + JIT)
• AOT of the same repro — compile-time named-arg check throws on the intentional gettext(msgid:) negative case (not in done-when)
• Full ci-fast.sh / ci-local.sh not run (targeted gate only)

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/issue_24375_gettext_named_params.php'

gettext: message
ngettext: singular plural count
dgettext: domain message
dngettext: domain singular plural count
bindtextdomain: domain directory
x
items
World
a
bind-ok
Unknown named parameter $msgid

JIT (php bin/jit.php same repro): identical output.

./script/phpunit.sh --filter testGettextFamilyZendStubNamedParams
OK (1 test, 31 assertions)

./script/phpunit.sh --filter GettextNamedParams24375
OK (2 tests, 2 assertions)

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