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_sanity.ts

@@ -0,0 +1,19 @@
+import { Floatplane, version } from "./index.js";
+
+const fApi = new Floatplane({
+	authConfig: {
+		serverUrl: "https://auth.floatplane.com/realms/floatplane-pp",
+		clientId: "floatplane-downloader",
+		onDeviceCode: ({ verification_uri_complete }) => console.log(`Go to ${verification_uri_complete} to complete login...`),
+	},
+	baseUrl: "https://pp.floatplane.com",
+}); // Create a new API instance.
+
+// console.log("Logged in!", await fApi.refreshAuthToken());
+// console.log("Refreshed", await fApi.refreshAuthToken());
+
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore Yes, package.json isnt under src, this is fine
+import pkg from "../package.json" with { type: "json" };
+
+if (pkg.version !== version) throw new Error(`Version mismatch! package.json says ${pkg.version} but index says ${version}`);