.NET 10 Updates

[FritzTheCat9]

• Upgrade project to .NET 10 and C# 14
• Migrate solution file from .sln to .slnx
• Enable Central Package Management for NuGet packages
• Fix Swagger and MudBlazor compatibility after .NET 10 update
• Remove FluentAssertions NuGet package (now commercial)
• Update Docker files to .NET 10
• Fix unit tests