feat: yt-dlp prefers H.264, falls back to built-in, no pipe hang (v1.0.0.13)

- Format string prefers avc1 video + m4a audio, then any codec. The RTX 2070
  host can hardware-transcode H.264 but not AV1.
- Pass Jellyfin's ffmpeg via --ffmpeg-location instead of relying on PATH.
- If yt-dlp fails, retry with the built-in YoutubeExplode downloader.
- Read stdout/stderr while yt-dlp runs (and add --no-progress); before,
  stdout was never read, so a full pipe buffer could block yt-dlp forever.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Jellyfin.Plugin.CinemaTrailers4Jellyfins.csproj

@@ -3,8 +3,8 @@
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>Jellyfin.Plugin.CinemaTrailers4Jellyfins</RootNamespace>
-    <AssemblyVersion>1.0.0.12</AssemblyVersion>
-    <FileVersion>1.0.0.12</FileVersion>
+    <AssemblyVersion>1.0.0.13</AssemblyVersion>
+    <FileVersion>1.0.0.13</FileVersion>
     <Nullable>enable</Nullable>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>