v0.3.7 — Bots module

Bot traffic vs human. Blocked bot beacons (self-declared crawlers + asset-path scrapers) are now counted in a new bot_hits table instead of dropped silently. New Bots dashboard card: share-of-traffic split, blocked vs human counts, top crawler names. Human stats queries and rollups untouched; bot rows follow each site's retention window.

Also: dashboard footer.

Run migrations after updating (the built-in updater does this automatically).