Add docs/INSTALL.md with two installation paths:
- Option A: Docker Compose (all-in-one with PostgreSQL, MinIO,
OpenLDAP, and optional nginx)
- Option B: Daemon install (systemd with external services, links to
setup instructions for PostgreSQL, MinIO, FreeIPA, nginx)
Includes LDAP user/group management instructions, verification steps,
and upgrade procedures for both paths.
Update README.md Quick Start to point to INSTALL.md, add to docs table.
Add redirect banner to DEPLOYMENT.md for first-time users.
Add comments to docker-compose.prod.yaml noting unsupported env vars.