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/test_AuthV3API.py

@@ -0,0 +1,7 @@
+import schemathesis
+
+schema = schemathesis.from_path("../../src/floatplane-openapi-specification-trimmed.json", base_url="https://floatplane.com")
+
+@schema.parametrize(endpoint="/api/v3/auth/captcha/info")
+def test_AuthAPIV3_CaptchaInfo(case):
+    case.call_and_validate()