Implement Single Sign-On (SSO) Integration

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Overview

Add SSO support using SAML 2.0 and OIDC to enable enterprise authentication integration.

Business Value

SSO is required for enterprise customers who need to integrate with their identity providers.

Current State

• Multiple auth providers exist (Clerk, Authelia, Neon)
• No SSO/SAML support
• No OIDC support

Subtasks

• Implement SAML 2.0 support
• Implement OIDC support
• Add SSO configuration UI
• Implement SSO user mapping
• Add SSO testing
• Document SSO setup

Implementation Steps

1. Add SAML library
2. Implement SAML handler
3. Add OIDC support
4. Create SSO configuration
5. Test with providers

Acceptance Criteria

• SAML 2.0 works
• OIDC works
• SSO can be configured
• User mapping works
• Documentation is complete

Estimated Effort

• Hours: 32-40
• Complexity: High