Move scattered configuration tables and operational sections out of the
README into dedicated reference documents:
- docs/configuration.md: single source of truth for all environment
variables, grouped into 12 sections (Common, Database, Caching,
Collector, Webhooks, Auth, Data Retention, API, Web Dashboard,
Feature Flags, Traefik, Prometheus & Alertmanager)
- docs/deployment.md: production setup, reverse proxy, multi-instance,
API scaling, Redis caching
- docs/observer.md: remote observers plus PACKETCAPTURE_* and
SERIAL_PORT reference
- docs/maintenance.md: backup and restore
README is reduced from 712 to 385 lines; the ARM32/Raspberry Pi note
is dropped. database.md, auth.md, webhooks.md, and content.md have
their env-var tables removed and link back to configuration.md. Stale
cross-references in database.md, upgrading.md, and .env.example are
updated to point at the new locations.
Louis King