Use TV guide for livestreams

Jellyfin.Plugin.SRFPlay/Utilities/Extensions.cs

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+using Jellyfin.Plugin.SRFPlay.Configuration;
+using MediaBrowser.Controller.Entities;
+
+namespace Jellyfin.Plugin.SRFPlay.Utilities;
+
+/// <summary>
+/// Extension methods for common plugin operations.
+/// </summary>
+public static class Extensions
+{
+    /// <summary>
+    /// Gets the SRF URN from the item's provider IDs.
+    /// </summary>
+    /// <param name="item">The base item.</param>
+    /// <returns>The SRF URN, or null if not found or empty.</returns>
+    public static string? GetSrfUrn(this BaseItem item)
+    {
+        return item.ProviderIds.TryGetValue("SRF", out var urn) && !string.IsNullOrEmpty(urn)
+            ? urn
+            : null;
+    }
+
+    /// <summary>
+    /// Converts the BusinessUnit enum to its lowercase string representation.
+    /// </summary>
+    /// <param name="businessUnit">The business unit.</param>
+    /// <returns>The lowercase string representation.</returns>
+    public static string ToLowerString(this BusinessUnit businessUnit)
+    {
+        return businessUnit.ToString().ToLowerInvariant();
+    }
+
+    /// <summary>
+    /// Gets the plugin configuration safely, returning null if not available.
+    /// </summary>
+    /// <returns>The plugin configuration, or null if not available.</returns>
+    public static PluginConfiguration? GetPluginConfig()
+    {
+        return Plugin.Instance?.Configuration;
+    }
+}