Moved DecryptConnectionString to KBR.Shared.Extensions for reuse and improved configuration access. Added Encryption property to CacheOptions and appsettings for conditional decryption of cache connection strings. Updated ServiceCollectionExtensions to decrypt SQL Server cache connection strings when needed. Upgraded NuGet packages across projects to latest .NET 8/10.0.x versions. Included minor code cleanups and OpenApiSecurityScheme improvements.
Upgraded projects to .NET 9.0 and added new projects `KBR.Cache`, `KBR.Shared`, and `KBR.Shared.Lite` to the solution. Introduced JWT authentication and OTP handling with new models, services, and configuration options. Updated database schema with new entities `Users` and `RefreshTokens`, and added migrations for schema changes. Implemented caching strategies using `AppDistributedCache` with support for in-memory, SQL Server, and Redis. Enhanced email handling with `MailHelpers` for domain replacement. Updated controllers, repositories, and configuration files to support new features.
