Fix CI: disable uv caching

Remove enable-cache to avoid lock file requirement.
Caching can be re-enabled later with a proper lock file.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ChanceSiyuan

.github/workflows/test.yml

@@ -18,9 +18,6 @@ jobs:
 
     - name: Install uv
       uses: astral-sh/setup-uv@v4
-      with:
-        enable-cache: true
-        ignore-nothing-to-cache: true
 
     - name: Set up Python ${{ matrix.python-version }}
       run: uv python install ${{ matrix.python-version }}