Serves the `oidc` capability socket from a pasted issuer + clientId + clientSecret, so consumers that plug `oidc` (including the Cloudron `oidc` addon path) map onto Auth0 / Cognito / Okta / Google without bundling Keycloak. Register the OIDC application at the provider, paste its credentials here. Presets: Auth0 (issuer https://<tenant>.us.auth0.com/), AWS Cognito (https://cognito-idp.<region>.amazonaws.com/<userPoolId>), Okta (https://<org>.okta.com/), Google (https://accounts.google.com).