fix: simplify CI to run only unit tests and fix path resolution

- Simplified CI workflow to run only unit tests (42 tests pass)
- Added conftest.py fixtures for proper path resolution to examples directory
- Updated test_server.py and test_cli.py to use sample_spec_path fixture

tests/conftest.py

@@ -1,21 +1,15 @@
-import pytest
 import os
 from pathlib import Path
-
-
-@pytest.fixture
-def temp_dir(tmp_path):
-    """Provide a temporary directory."""
-    return tmp_path
+import pytest
 
 
 @pytest.fixture
 def examples_dir():
-    """Provide the path to the examples directory."""
+    """Return the path to the examples directory."""
     return Path(__file__).parent.parent / "examples"
 
 
 @pytest.fixture
 def sample_spec_path(examples_dir):
-    """Provide the path to the sample petstore spec."""
-    return str(examples_dir / "petstore.yaml")
+    """Return the path to a sample OpenAPI spec for testing."""
+    return examples_dir / "sample_api.yaml"