Kikobeats / url-http / 31023409704

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perf: avoid rebuilding url-regex-safe patterns per call

The two fixed regex shapes (exact for ordinary hosts, unanchored for IPv6
authorities) are now built once at load, and per-IDN-TLD regexes are memoized
in a 256-entry FIFO cache bounded against caller-supplied xn-- labels.

Measured per call: 21.6us to 0.35us on ordinary hosts, 3.8us to 0.48us on
punycode hosts.

Also drops the scheme regex in favour of the parser's own normalized
`protocol`, and removes the loose match against the full href on the IPv6
path: `origin + '/'` is always a prefix of `href` for special schemes, so
matching the origin implies matching the href.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G3AcnZdy222rWCkptbywJT

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