feat(ui): add OIDC self-serve SSO configuration

[NicolasLopes7]

Summary

• expand the experimental custom OIDC SSO flow into a guided configuration wizard for the authorized redirect URI, required ID-token claims, provider endpoints, and client credentials
• support both discovery URL and manual endpoint configuration, including returning to existing OIDC configurations with their saved settings
• share the identity-provider configuration-mode components between the OIDC and SAML flows, and recognize custom OIDC provider keys

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Latest commit: 680de51

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