Rename HF_TOKEN secret to HF_TOKEN_DEV for symmetry with HF_TOKEN_PROD (#17)

Claude-Session: https://claude.ai/code/session_01DJSHbr6L4hXcGdYoL3MQbA

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/deploy-dev.yml

@@ -19,6 +19,6 @@ jobs:
 
       - name: Push to Hugging Face Space
         env:
-          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+          HF_TOKEN: ${{ secrets.HF_TOKEN_DEV }}
         run: |
           git push --force "https://user:${HF_TOKEN}@huggingface.co/spaces/someone-in-the-world/HighQualityVideoGeneration-dev" develop:main