Update CLAUDE.md — about/contact pages + HF Dockerfile note

CLAUDE.md

@@ -33,6 +33,15 @@
 | `stop.sh` | Stop all services |
 | `start_hf.sh` | HF Spaces startup script |
 | `requirements-translation.txt` | LibreTranslate version pin |
+| `about.html`    | About page — mission, features, builder, special thanks |
+| `contact.html`  | Contact page — email, GitHub, YouTube links |
+
+And add note:
+
+## Important Deployment Note
+HF Spaces uses `Dockerfile` (not `Dockerfile.hf`) for building.
+Always keep both files in sync: cp Dockerfile.hf Dockerfile before deploying.
+
 
 ## 🔧 Environment Variables