feat: add a return of the data that has been configured

ApiDto/Responses/AvailableOAuthProvidersResponse.cs

@@ -0,0 +1,27 @@
+using Mirea.Api.Dto.Common;
+using System.ComponentModel.DataAnnotations;
+
+namespace Mirea.Api.Dto.Responses;
+
+/// <summary>
+/// Represents the response containing information about available OAuth providers.
+/// </summary>
+public class AvailableOAuthProvidersResponse
+{
+    /// <summary>
+    /// Gets or sets the name of the OAuth provider.
+    /// </summary>
+    [Required]
+    public required string ProviderName { get; set; }
+
+    /// <summary>
+    /// Gets or sets the enum value representing the OAuth provider.
+    /// </summary>
+    public OAuthProvider Provider { get; set; }
+
+    /// <summary>
+    /// Gets or sets the redirect URL for the OAuth provider's authorization process.
+    /// </summary>
+    [Required]
+    public required string Redirect { get; set; }
+}