Floatplane channel plugin for Jellyfin 10.10.x: browse, HLS proxy, cookie session, CI release

- IChannel: creators -> sub-channels -> video posts (public listing API, search mapped)
- IRequiresMediaInfoCallback -> signed proxy URLs; stream controller rewrites HLS so the
  AES-128 key is fetched server-side with the session cookie, segments stay on the CDN
- delivery/info cached per token lifetime and throttled (~2/min)
- config page: paste sails.sid + validate, extra creators, quality, search test
- scripts/package.sh -> plugin folder + zip + md5 + manifest.json; Gitea release workflow
- research docs, HAR analysis (HAR itself gitignored), install-pi5.sh

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Jellyfin.Plugin.Floatplane/Tasks/FloatplaneSyncTask.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.Floatplane.Channel;
+using MediaBrowser.Model.Tasks;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.Floatplane.Tasks;
+
+/// <summary>
+/// Scheduled task: refresh creators/channels and warm the newest posts, then bump the
+/// channel cache key so Jellyfin re-lists on the next browse. Found by type scanning.
+/// </summary>
+public class FloatplaneSyncTask : IScheduledTask, IConfigurableScheduledTask
+{
+    private readonly CatalogService _catalog;
+    private readonly ILogger<FloatplaneSyncTask> _logger;
+
+    public FloatplaneSyncTask(CatalogService catalog, ILogger<FloatplaneSyncTask> logger)
+    {
+        _catalog = catalog;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    public string Name => "Refresh Floatplane catalogue";
+
+    /// <inheritdoc />
+    public string Key => "FloatplaneSync";
+
+    /// <inheritdoc />
+    public string Description => "Reloads subscribed creators, their channels and the newest videos from Floatplane.";
+
+    /// <inheritdoc />
+    public string Category => "Floatplane";
+
+    /// <inheritdoc />
+    public bool IsHidden => false;
+
+    /// <inheritdoc />
+    public bool IsEnabled => true;
+
+    /// <inheritdoc />
+    public bool IsLogged => true;
+
+    /// <inheritdoc />
+    public async Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Floatplane sync started");
+        await _catalog.RefreshAsync(progress, cancellationToken).ConfigureAwait(false);
+        _logger.LogInformation("Floatplane sync finished: {Creators} creators, generation {Gen}", _catalog.Creators.Count, _catalog.Generation);
+    }
+
+    /// <inheritdoc />
+    public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
+    {
+        var hours = Math.Clamp(Plugin.Instance?.Configuration.SyncIntervalHours ?? 6, 1, 168);
+        return
+        [
+            new TaskTriggerInfo { Type = TaskTriggerInfo.TriggerStartup },
+            new TaskTriggerInfo { Type = TaskTriggerInfo.TriggerInterval, IntervalTicks = TimeSpan.FromHours(hours).Ticks }
+        ];
+    }
+}