Remove leftover ModelScope duplicate in index.html

Fix package.json: remove duplicate/malformed block and invalid dotenv version

Refactor to HF-only OAuth demo aligned with ms-oauth-studio structure

Fix Hugging Face Spaces OAuth: use hf_oauth metadata, SPACE_HOST redirect and Basic auth

Add Hugging Face Space deployment and OAuth setup instructions

Add Hugging Face Space README metadata

Prepare Docker Space deployment for Hugging Face OAuth demo

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