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/hydra_getVideoTokenTask.brs

@@ -0,0 +1,15 @@
+sub init()
+  m.top.functionName = "getToken"
+end sub
+
+sub getToken()
+  ' Runs on task thread: safe to call getAccessToken(false) and thus refresh via roUrlTransfer
+  tokenUtilObj = TokenUtil()
+  accessToken = tokenUtilObj.getAccessToken(false)
+  if accessToken <> invalid then
+    m.top.accessToken = accessToken
+  else
+    m.top.error = "Not authenticated - please login"
+  end if
+  m.top.done = true
+end sub