chore: update CI workflow to use actions/cache@v3 and actions/upload-artifact@v3, add coverage summary step

.gitea/workflows/ci.yaml

@@ -30,7 +30,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       
       - name: Cache uv dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v3
         with:
           path: |
             ~/.cache/uv
@@ -86,8 +86,13 @@ jobs:
           TERM: "dumb"
           PYTHONIOENCODING: "utf-8"
       
+      - name: Show coverage summary
+        run: |
+          echo "📊 Coverage Summary:"
+          uv run coverage report --show-missing
+      
       - name: Upload coverage artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: coverage-report
           path: htmlcov/