fix lint issues

Author: longendu

.github/workflows/lint.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Install dependencies
       run: |
         curl -LsSf https://astral.sh/uv/install.sh | sh
-        ~/.local/bin/uv sync
+        ~/.local/bin/uv sync --all-extras
     - name: Lint with ruff
       run: |
         ~/.local/bin/uv run ruff check aiutil/ tests/

tests/filesystem/test_filesystem.py

@@ -1,7 +1,7 @@
 """Test dataframe.py."""
 
 from pathlib import Path
-import aiutil
+import aiutil.filesystem
 
 BASE_DIR = Path(__file__).resolve().parent