compile reports on AI traffic

compile reports on AI traffic

The reports run on the systemd analogue of a cron and get written
daily to /var/log/ai-bot-digest.

To support this endeavor, we add hostname and content-type to the end
of the Nginx log lines.

That in turn also ended up inspiring an obscure GitWeb monkey-patch,
since the logs showed a crawler requesting a plain blob, which was
being served as ISO-8859-1 and would have suffered from mojibake.

None of this would have been remotely possi—well, economically
feasible—without Claude Code. (Opus 5 was today's model, in contrast
to previous work in this repo done by Sonnet 5.)