Add _auth_label() classifier: local/anon/guest/authed — no PII, just
enough to distinguish traffic types in docker logs for log-based analytics.
Instrument /api/session: logs new_guest (with UUID) or auth=.../tier=...
on every session bootstrap. Instrument /api/search: expands existing
multi-search log line with auth=, tier=, adapter=, pages=, queries=,
listings= fields for grep/awk analysis of search behaviour by tier.
Add logging.basicConfig so app-level log.info() calls appear in docker
logs alongside the Uvicorn access log (previously suppressed by missing
root handler).
pyr0ball
873b9a1413