fix: update test workflow to run all tests instead of just unit tests

Author: tumf

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
         pip install -e .
     - name: Run unit tests with coverage
       run: |
-        pytest --cov=web3_mcp --cov-report=xml --cov-report=term tests/unit
+        pytest --cov=web3_mcp --cov-report=xml --cov-report=term tests
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v4
       with: