MPC is generic infrastructure — no hardcoded tenant URLs.
- Remove pars.network, zoo.network from OIDC issuers, ingress, TLS
- Remove satschel.com, liquidity.io from CORS, WebAuthn, tests
- CORS/WebAuthn origins now env-driven: MPC_CORS_ORIGINS, MPC_WEBAUTHN_ORIGINS
- Ingress: mpc.lux.network only — tenants route through their own ingress
- Tests updated to match infrastructure-only origin lists