feat(bot): add stats tracking and http dashboard
- persistent stats to /data/stats.json (survives restarts)
- tracks posts checked, matches found, posts created, cooldowns, errors
- per-bufo match counts with urls
- http dashboard on configurable port (default 8080)
- fly.toml updated for http service + volume mount
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>