Keycloak owns :8080 in the dev stack (docker-compose binds host:8080).
Running tenant-registry on the same port made 'make dev' refuse to
boot. Bump the default to :8090 across config, Makefile, Dockerfile,
.env.example, and README. ADDR env var still overrides if needed.
Production is unaffected — each service is in its own Orca container
with its own port-namespace.
Refs: M5.1 (unblocks portal local dev)
sharang