- Added support for data protection keys by integrating Entity Framework Core for key persistence.
- Updated `Program.cs` and `MemberCenterDbContext.cs` to configure data protection services.
- Introduced new migration to create `DataProtectionKeys` table in the database.
- Enhanced cookie settings for authentication to enforce security policies (SameSite=None, Secure=Always).
- Updated installation documentation with new authentication configuration options.
- Added subscription management for logged-in users, allowing them to view and unsubscribe from newsletters directly.
- Introduced profile maintenance features, enabling users to update personal information and manage addresses.
- Expanded API scopes for profile access, including read/write permissions for basic info, addresses, and subscriptions.
- Updated installation documentation to reflect new audience settings for authentication resources.
- Improved OpenAPI documentation with new profile scopes and authorization models.
- Created a comprehensive member upgrade plan outlining system settings, email verification, account roles, and subscription management.
- Updated OpenAPI documentation to include new OAuth2 usage types: `send_api`.
- Added endpoints for issuing one-click unsubscribe tokens in both single and batch requests.
- Modified OAuth client creation and management to enforce new usage types and redirect URI requirements.
- Implemented logic in the Newsletter service to handle one-click unsubscribe token issuance.
- Updated UI to reflect changes in OAuth client usage options and redirect URI handling.
- Enhanced token generation logic to support new scopes and audience settings for Send Engine.
