v0.2: All videos folder, shared watched state, release-order sorting, official icon, OAuth plumbing, docs

- per-creator "All videos" folder (release order across sub-channels); sub-channel copies use
  cpost: ids and UserDataMirror keeps played/resume state in sync
- SortNameUpdater forces release-order sort names so every client lists newest first by default
- official Floatplane icon as channel image (Primary only — a channel Thumb hid video thumbnails
  in Continue Watching) and as 16:9 plugin thumbnail; one-time image replacement on upgrade
- OAuth device-flow login (FloatplaneAuthService + settings UI); needs a Floatplane client id;
  Turnstile verified domain-bound so password login inside Jellyfin is impossible
- generic install.sh (linuxserver / official image / native), thumb.png in package + manifest
- README rewritten for a general audience, doc/usage.md with screenshots, 60 tests

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -6,7 +6,7 @@ name: release
 #   - tagg vX.Y.Z             -> versionerad release (plugin-version X.Y.Z.0)
 #   - workflow_dispatch       -> valfri tag (tom = latest)
 # Assets: floatplane_<ver>.zip (+.md5), manifest.json (Jellyfins plugin-
-# repository-format) och install-pi5.sh. manifest.json laddas ALLTID upp
+# repository-format) och install.sh. manifest.json laddas ALLTID upp
 # till "latest" sa att URL:en nedan alltid pekar pa nyaste versionen:
 #   https://gitea.brasse-pc.eu/brasse/jellyfin-plugin-floatplane/releases/download/latest/manifest.json
 #
@@ -124,7 +124,7 @@ jobs:
             Sedan Plugins -> Catalog -> Floatplane -> Install, starta om Jellyfin.
 
           Manuell installation pa en host med linuxserver/jellyfin-containern:
-            curl -fsSL $REPO_URL/releases/download/$TAG/install-pi5.sh | sh
+            curl -fsSL $REPO_URL/releases/download/$TAG/install.sh | sh
           (TAG=... JELLYFIN_CONFIG_DIR=... JELLYFIN_CONTAINER=... och --dry-run stods, se skriptet.)
 
           Efter installation: Dashboard -> Plugins -> Floatplane -> klistra in sails.sid-cookien."
@@ -159,7 +159,8 @@ jobs:
           upload "$rid" "$ZIP"          "build/$ZIP"
           upload "$rid" "$ZIP.md5"      "build/$ZIP.md5"
           upload "$rid" "manifest.json" "build/manifest.json"
-          upload "$rid" "install-pi5.sh" "install-pi5.sh"
+          upload "$rid" "install.sh" "install.sh"
+          upload "$rid" "thumb.png" "build/thumb.png"
           echo "klart: https://gitea.brasse-pc.eu/$REPO/releases/tag/$TAG"
 
           # --- manifest.json aven till "latest" vid taggad release --------------
@@ -175,7 +176,8 @@ jobs:
             fi
             if [ -n "$lid" ] && [ "$lid" != "null" ]; then
               upload "$lid" "manifest.json" "build/manifest.json.keep"
-              upload "$lid" "install-pi5.sh" "install-pi5.sh"
+              upload "$lid" "install.sh" "install.sh"
+              upload "$lid" "thumb.png" "build/thumb.png"
               echo "manifest.json uppdaterat pa latest: $REPO_URL/releases/download/latest/manifest.json"
             else
               echo "::warning::kunde inte hitta/skapa latest-releasen for manifest.json"