Bundle soundfile with native libs in PyInstaller, link LICENSE in README

soundfile needs collect_all() to include libsndfile native library —
hiddenimports alone wasn't enough, causing 'No module named soundfile'
in the frozen sidecar. This is needed for the pyannote Audio patch
that bypasses torchaudio/torchcodec.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -126,4 +126,4 @@ docs/                       # Documentation
 
 ## License
 
-MIT
+[MIT](LICENSE)