Security: Throttle search, cap its words and give the query a deadline

/search runs an unindexed regular-expression scan over every published
post, built from up to fifty ".*"-joined words, for anyone who asks —
the cheapest way for a bot to keep Postgres busy. Queries are now cut
at eight words (more never improve the answer), each address gets
thirty searches and then thirty a minute, and the statement is
cancelled after five seconds; a timeout reads as no results and is
logged, rather than a 500.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

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