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>

doc/research/reference-sources/fpts_user.ts

@@ -0,0 +1,17 @@
+import { Core } from "./Core.js";
+import { ApiPaths, components } from "./lib/apiSchema.js";
+
+export type UserSubscription = components["schemas"]["UserSubscriptionModel"];
+export type Self = components["schemas"]["UserSelfV3Response"];
+
+export class User extends Core {
+	/**
+	 * Fetch subscriptions for the logged in user.
+	 */
+	subscriptions = (): Promise<UserSubscription[]> => this.got(this.baseUrl + ApiPaths.listUserSubscriptionsV3).json<UserSubscription[]>();
+
+	/**
+	 * Fetch information about the logged in user.
+	 */
+	self = (): Promise<Self> => this.got(this.baseUrl + ApiPaths.getSelf).json<Self>();
+}