- Added Redis caching support to the IAM service, including configuration settings in `appsettings.json` and environment variables.
- Introduced `ICacheService` interface for caching operations and implemented `RedisCacheService`.
- Updated documentation to include Redis setup instructions and usage examples for caching user data and token management.
- Enhanced user account management by adding an `Activate` method to the `ApplicationUser` class.
- Fixed assertions in unit tests to reflect the updated user status after activation.
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