fix(search): align with Composer's RepositoryInterface::search

Replace the HTTP-only post-filtered implementation with a Repository::search
trait dispatch that mirrors ComposerRepository::search semantics for all
three modes (FULLTEXT/NAME/VENDOR). --only-name now does an OR-of-tokens
regex match against the full Packagist list.json index instead of a
substring match against a fulltext page, so e.g. \`mozart search --only-name
mono log\` matches \`monolog/monolog\` like Composer does. Other parity
fixes: regex::escape on non-fulltext queries, format check before mutex
check, 4-space JSON indent, OSC 8 terminal hyperlink emission when a
result has a url, <warning>\! Abandoned \!</warning> styling on abandoned
rows, and the Mozart-only "No packages found" warning is dropped to match
Composer's silent empty-result behavior.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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