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/Plugin.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Jellyfin.Plugin.Floatplane.Configuration;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.Plugins;
+using MediaBrowser.Model.Plugins;
+using MediaBrowser.Model.Serialization;
+
+namespace Jellyfin.Plugin.Floatplane;
+
+/// <summary>
+/// Floatplane plugin — exposes Floatplane subscriptions as a Jellyfin channel.
+/// </summary>
+public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
+{
+    /// <summary>Plugin GUID; must match <c>build.yaml</c> / <c>meta.json</c>.</summary>
+    public const string PluginGuid = "7f2b6c1e-5a3d-4e8f-9b0a-2c4d6e8f0a1b";
+
+    public Plugin(IApplicationPaths applicationPaths, IXmlSerializer xmlSerializer)
+        : base(applicationPaths, xmlSerializer)
+    {
+        Instance = this;
+    }
+
+    /// <inheritdoc />
+    public override string Name => "Floatplane";
+
+    /// <inheritdoc />
+    public override Guid Id => Guid.Parse(PluginGuid);
+
+    /// <inheritdoc />
+    public override string Description => "Browse and play your Floatplane subscriptions inside Jellyfin.";
+
+    /// <summary>Gets the current plugin instance.</summary>
+    public static Plugin? Instance { get; private set; }
+
+    /// <summary>Gets the User-Agent the plugin identifies itself with towards Floatplane.</summary>
+    public static string UserAgent { get; } = string.Format(
+        CultureInfo.InvariantCulture,
+        "Jellyfin-Floatplane/{0} (+https://gitea.brasse-pc.eu/brasse/jellyfin-plugin-floatplane)",
+        typeof(Plugin).Assembly.GetName().Version?.ToString(3) ?? "0.0.0");
+
+    /// <inheritdoc />
+    public IEnumerable<PluginPageInfo> GetPages()
+    {
+        return
+        [
+            new PluginPageInfo
+            {
+                Name = Name,
+                EmbeddedResourcePath = string.Format(
+                    CultureInfo.InvariantCulture,
+                    "{0}.Configuration.configPage.html",
+                    GetType().Namespace)
+            }
+        ];
+    }
+}