First POC with podcasts library

Jellyfin.Plugin.Jellypod/Services/IRssFeedService.cs

@@ -0,0 +1,19 @@
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.Jellypod.Models;
+
+namespace Jellyfin.Plugin.Jellypod.Services;
+
+/// <summary>
+/// Service for fetching and parsing podcast RSS feeds.
+/// </summary>
+public interface IRssFeedService
+{
+    /// <summary>
+    /// Fetches and parses a podcast from an RSS feed URL.
+    /// </summary>
+    /// <param name="feedUrl">The RSS feed URL.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The parsed podcast with episodes, or null if parsing failed.</returns>
+    Task<Podcast?> FetchPodcastAsync(string feedUrl, CancellationToken cancellationToken = default);
+}