feat(web): Add /health and /version endpoints to ADK web server

These endpoints provide basic health checks and version information for the running ADK server, including the ADK version and Python runtime details. The version information will be used to generate ADK conformance test report.

Co-authored-by: Liang Wu <wuliang@google.com>
PiperOrigin-RevId: 868283421

tests/unittests/cli/test_fast_api.py

@@ -1530,5 +1530,23 @@ def test_builder_save_rejects_traversal(builder_test_client, tmp_path):
   assert not (tmp_path / "app" / "tmp" / "escape.yaml").exists()
 
 
+def test_health_endpoint(test_app):
+  """Test the health endpoint."""
+  response = test_app.get("/health")
+  assert response.status_code == 200
+  assert response.json() == {"status": "ok"}
+
+
+def test_version_endpoint(test_app):
+  """Test the version endpoint."""
+  response = test_app.get("/version")
+  assert response.status_code == 200
+  data = response.json()
+  assert "version" in data
+  assert "language" in data
+  assert data["language"] == "python"
+  assert "language_version" in data
+
+
 if __name__ == "__main__":
   pytest.main(["-xvs", __file__])