chore: group .NET into backend/ and drop non-.NET test artifacts

- Move all .NET (6 projects, solution, Directory.*.props, nuget.config)
  into backend/ so the monorepo root can host non-.NET projects later
- Remove throwaway test artifacts: player.html, pl.json
- Trim dead Flutter rules from .gitignore

Build from backend/Musify.slnx: 0 warnings, 0 errors.

backend/Musify.Application/MusifyApplication.cs

@@ -0,0 +1,4 @@
+using Mediator;
+using Microsoft.Extensions.DependencyInjection;
+
+[assembly: MediatorOptions(ServiceLifetime = ServiceLifetime.Scoped)]