Add .gitattributes and .gitignore

.gitignore

@@ -0,0 +1,28 @@
+# Large dataset directories (由 Git LFS 或外部管理)
+data/
+datasets/
+*.tar
+*.tar.gz
+*.zip
+
+# Python
+__pycache__/
+*.py[cod]
+
+# IDE / Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+Desktop.ini
+
+# Logs
+*.log
+
+# Jupyter
+.ipynb_checkpoints/