Takes care of constructing the full scry path based off the given
components. Fills in timestamp with the current time. Logs errors on
result conversion failures.
Make KingSubsite part of ServConf, handle 404 case more gracefully, make
slog endpoint send SSE headers immediately.
Remaining work mostly revolves around the slog endpoint's slog queue. It
builds up even if nobody is listening, and only the first to pull from
the queue gets to handle/emit the slog event.
