I took the liberty to update SynoAI from .Net 5 to .Net 7 and also applied some fixes suggested by the dotnet compiler after enabling code analysis.

• Update csproj, docker and github actions to use dotnet 7
• Updated all referenced NuGet packages to their latest version
• Enabled TreatWarningsAsErrors during the build
• Enabled code analysis during the build by adding AnalysisLevel 6.0-recommended to the csproj file and fixed most of the warnings/errors they produced
• Excluded some errors from the build (some of which need to be fixed, like the one about logging)
• Made a lot of classes internal, this way the XML docs are not required for them
• Enabled the usage of a package.lock.json file
• Enabled ImplicitUsings and removed a lot of using from the classes

I hope this helps in the performance and stability of SynoAI. .NET 7 should be faster and have a lower memory footprint than .NET 5. If you approve this and like my changes, I will invest some more time in code optimizations. First by getting rid of all the warnings and then see if there are other places where the code could be improved.