fix(bot): add missing DI registrations for shared DeleteSessionHandler and ListSessionsHandler

PR #106 extracted DeleteSessionHandler and ListSessionsHandler to GmRelay.Shared,
but forgot to register the shared implementations in Program.cs. This caused
an InvalidOperationException at startup on Native AOT builds because the Bot
wrappers could not resolve their shared dependencies.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.Bot/Program.cs

@@ -73,7 +73,9 @@ builder.Services.AddSingleton<JoinSessionHandler>();
 builder.Services.AddSingleton<LeaveSessionHandler>();
 builder.Services.AddSingleton<PromoteWaitlistedPlayerHandler>();
 builder.Services.AddSingleton<CancelSessionHandler>();
+builder.Services.AddSingleton<GmRelay.Shared.Features.Sessions.ListSessions.DeleteSessionHandler>();
 builder.Services.AddSingleton<GmRelay.Bot.Features.Sessions.ListSessions.DeleteSessionHandler>();
+builder.Services.AddSingleton<GmRelay.Shared.Features.Sessions.ListSessions.ListSessionsHandler>();
 builder.Services.AddSingleton<GmRelay.Bot.Features.Sessions.ListSessions.ListSessionsHandler>();
 builder.Services.AddSingleton<GmRelay.Shared.Features.Sessions.ExportCalendar.ExportCalendarHandler>();
 builder.Services.AddSingleton<GmRelay.Bot.Features.Sessions.ExportCalendar.ExportCalendarHandler>();