- Add `cardPath` parameter to `show` method in NsfwLevelSelector component
- Include `filePath` from card dataset when calling selector in ModelContextMenuMixin
- Clear `cardPath` from dataset when hiding selector to prevent stale data
This enables the NSFW level selector to access the file path context, which may be needed for backend operations when changing NSFW levels.
Add new POST endpoint `/api/lm/example-images/set-nsfw-level` to allow updating NSFW classification for individual example images. The endpoint supports both regular and custom images, validates required parameters, and updates the corresponding model metadata. This enables users to manually adjust NSFW ratings for better content filtering.