feat(ffmpeg): add ffmpeg manager, bundle/download ffmpeg in CI and (#11)

* feat(ffmpeg): add ffmpeg manager, bundle/download ffmpeg in CI and

* fix(download-engine): let yt-dlp merge format to avoid codec conflicts and use actual format for filenames

* chore(ci): replace monolithic job with platform-specific reusable jobs

* chore(ci): run build matrix for windows, macos, linux in one to

* feat(ci): remove platform matrix and platform gating to simplify build

* chore(ci): pin github-translate-action to specific commit to ensure

.github/workflows/translator.yaml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: lizheming/github-translate-action
+      - uses: lizheming/github-translate-action@c55aac477e98562d4faed9f77c54ab8306ae6ebf
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with: