Fix missing import

fix: Update header fallback for last-modified date in copy_images.py

- In g4f/image/copy_images.py, modified the line that retrieves the "date" header
- Changed from `date = response.headers.get("date")` to `date = response.headers.get("last-modified", response.headers.get("date"))` to fallback to "date" if "last-modified" is missing
- No other files or functions were modified besides this line

Fix video api

Update any_provider.py

Update Video.py

Add video provider

Fix show thumbnail

Update PuterJS

Fix special models in PuterJS

Update website.py