ci: Use CPU-only Torch to prevent disk space exhaustion

Author: Pomilon

.github/workflows/ci.yml

@@ -24,6 +24,8 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        # Install CPU-only Torch first to save space on GitHub Runner
+        pip install torch --index-url https://download.pytorch.org/whl/cpu
         pip install pytest pytest-cov pytest-asyncio
         pip install -r requirements.txt
         pip install -e .