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>

Jellyfin.Plugin.Floatplane/Jellyfin.Plugin.Floatplane.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <!-- Jellyfin 10.10.x = .NET 8. Keep this an AnyCPU IL assembly: no RuntimeIdentifier,
+         no SelfContained, no ReadyToRun — the same DLL runs on x64 and the Pi5 (arm64). -->
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Jellyfin.Plugin.Floatplane</RootNamespace>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>latest</LangVersion>
+    <NoWarn>$(NoWarn);CS1591</NoWarn>
+  </PropertyGroup>
+
+  <!-- Built against the oldest supported server (targetAbi 10.10.0.0 in meta.json). -->
+  <ItemGroup>
+    <PackageReference Include="Jellyfin.Controller" Version="10.10.7">
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </PackageReference>
+    <PackageReference Include="Jellyfin.Model" Version="10.10.7">
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <InternalsVisibleTo Include="Jellyfin.Plugin.Floatplane.Tests" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Remove="Configuration\configPage.html" />
+    <EmbeddedResource Include="Configuration\configPage.html" />
+    <None Remove="Resources\logo.png" />
+    <EmbeddedResource Include="Resources\logo.png" />
+  </ItemGroup>
+
+</Project>