Enhanced logging & error handling for auth and pg backups

- Add detailed debug/warning logs to authentication flows (AuthService, AuthorizationContext, WebSocketManager) for better traceability of auth attempts and failures.
- Log WebSocket authentication attempts, including IP, path, and token preview.
- Introduce PostgresVersionMismatchException for pg_dump/pg_restore version mismatches; parse and log server/client versions, clean up failed backups, and provide upgrade guidance.
- Add helper for parsing version mismatch errors.
- Update using directives and minor code cleanups.
- Update .csproj.user with new publish profile path.

Emby.Server.Implementations/HttpServer/WebSocketManager.cs

@@ -40,9 +40,23 @@ namespace Emby.Server.Implementations.HttpServer
         /// <inheritdoc />
         public async Task WebSocketRequestHandler(HttpContext context)
         {
+            _logger.LogDebug(
+                "WebSocket authentication attempt from {IP}, Path: {Path}, QueryString: {QueryString}",
+                context.Connection.RemoteIpAddress,
+                context.Request.Path,
+                context.Request.QueryString);
+
             var authorizationInfo = await _authService.Authenticate(context.Request).ConfigureAwait(false);
             if (!authorizationInfo.IsAuthenticated)
             {
+                var tokenPreview = authorizationInfo.HasToken && authorizationInfo.Token?.Length > 8
+                    ? authorizationInfo.Token.Substring(0, 8) + "..."
+                    : authorizationInfo.Token ?? "null";
+                _logger.LogDebug(
+                    "WebSocket authentication failed from {IP}. HasToken: {HasToken}, Token: {Token}",
+                    context.Connection.RemoteIpAddress,
+                    authorizationInfo.HasToken,
+                    tokenPreview);
                 throw new SecurityException("Token is required");
             }