feat: Enhance Python environment setup with system Python option and improve dependency installation

refactor: Clean up imports in currencies and users routes
fix: Update theme settings saving logic and clean up test imports

.gitea/workflows/test.yml

@@ -58,6 +58,7 @@ jobs:
         uses: ./.gitea/actions/setup-python-env
         with:
           install-playwright: ${{ matrix.target != 'e2e' }}
+          use-system-python: 'true'
 
       - name: Run tests
         run: |