Pin huggingface_hub<1.0 for gradio 4.44 compatibility

gradio 4.44.1 imports HfFolder from huggingface_hub at import time, but
>=0.28.0 resolved to huggingface_hub 1.x where HfFolder was removed, crashing
the app on startup. Cap to <1.0, which still provides Inference Providers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

requirements.txt

@@ -1,5 +1,6 @@
 gradio==4.44.1
-huggingface_hub>=0.28.0
+# gradio 4.44 imports HfFolder, removed in huggingface_hub 1.0 — keep <1.0 (still has Inference Providers).
+huggingface_hub>=0.28.0,<1.0
 requests>=2.32.0
 trafilatura>=1.12.0
 python-docx>=1.1.2