This implements Single Sign-On (SSO) functionality at the account level, allowing individual accounts to configure their own SSO settings.
Key changes:
- Added SSO configuration to account model with JSONB storage
- Implemented SSO settings UI in account settings panel
- Added feature flag to control SSO access (premium feature)
- Updated authentication flow to support account-level SSO
- Added proper validation and error handling
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Co-Authored-By: Claude <noreply@anthropic.com>