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/Extensions/ClaimsExtensions.cs

@@ -1,30 +0,0 @@
-using Microsoft.Identity.Web;
-using System.Security.Claims;
-
-namespace Shogi.Api.Extensions;
-
-public static class ClaimsExtensions
-{
-    // https://learn.microsoft.com/en-us/azure/active-directory/develop/id-tokens#payload-claims
-
-    /// <summary>
-    /// Get Id from claims after applying shogi-specific claims transformations.
-    /// </summary>
-    public static string GetShogiUserId(this ClaimsPrincipal self)
-    {
-        var id = self.GetNameIdentifierId();
-        if (string.IsNullOrEmpty(id)) throw new InvalidOperationException("Shogi UserId not found in claims.");
-        return id;
-    }
-
-    /// <summary>
-    /// Get display name from claims after applying shogi-specific claims transformations.
-    /// </summary>
-    public static string GetShogiUserDisplayname(this ClaimsPrincipal self)
-    {
-        var displayName = self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
-        if (string.IsNullOrEmpty(displayName)) throw new InvalidOperationException("Shogi Display name not found in claims.");
-        return displayName;
-    }
-
-}

Shogi.Api/Extensions/LogMiddleware.cs

@@ -1,50 +0,0 @@
-using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.Logging;
-using System.IO;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Shogi.Api.Extensions
-{
-	public class LogMiddleware
-	{
-		private readonly RequestDelegate next;
-		private readonly ILogger logger;
-
-
-		public LogMiddleware(RequestDelegate next, ILoggerFactory factory)
-		{
-			this.next = next;
-			logger = factory.CreateLogger<LogMiddleware>();
-		}
-
-		public async Task Invoke(HttpContext context)
-		{
-			try
-			{
-				await next(context);
-			}
-			finally
-			{
-				using var stream = new MemoryStream();
-				context.Request?.Body.CopyToAsync(stream);
-
-				logger.LogInformation("Request {method} {url} => {statusCode} \n Body: {body}",
-						context.Request?.Method,
-						context.Request?.Path.Value,
-						context.Response?.StatusCode,
-						Encoding.UTF8.GetString(stream.ToArray()));
-			}
-		}
-	}
-
-	public static class IApplicationBuilderExtensions
-	{
-		public static IApplicationBuilder UseRequestResponseLogging(this IApplicationBuilder builder)
-		{
-			builder.UseMiddleware<LogMiddleware>();
-			return builder;
-		}
-	}
-}