Added OPML support

Jellyfin.Plugin.Jellypod/Api/Models/OpmlImportError.cs

@@ -0,0 +1,22 @@
+namespace Jellyfin.Plugin.Jellypod.Api.Models;
+
+/// <summary>
+/// Details about a failed OPML feed import.
+/// </summary>
+public class OpmlImportError
+{
+    /// <summary>
+    /// Gets or sets the feed URL that failed.
+    /// </summary>
+    public string FeedUrl { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the feed title from OPML (if available).
+    /// </summary>
+    public string? Title { get; set; }
+
+    /// <summary>
+    /// Gets or sets the error message.
+    /// </summary>
+    public string Error { get; set; } = string.Empty;
+}