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perf: use prepared statements for hot database paths master

- Add prepared statements for all traffic bucket upserts - Add prepared statements for user agent and referer tracking - Add prepared statements for user and emoji lookups - Initialize all statements once at startup in initPreparedStatements() - Eliminates SQL parsing overhead on every request Prepared statements are pre-compiled by SQLite, avoiding repeated query parsing and optimization on each call. 🐙 Generated with Crush Assisted-by: Claude Sonnet 4 via Crush <crush@charm.land>