Replace custom socket implementation with SignalR.

Replace MSAL and custom cookie auth with Microsoft.Identity.EntityFramework
Also some UI redesign to accommodate different login experience.

Shogi.Api/Repositories/Dto/SessionDto.cs

@@ -1,5 +1,5 @@
 namespace Shogi.Api.Repositories.Dto;
 
-public readonly record struct SessionDto(string Name, string Player1, string Player2)
+public readonly record struct SessionDto(string Id, string Player1Id, string Player2Id)
 {
 }