Observer API Service
Available endpoints:
  GET /health - Health check
  GET /ws - WebSocket endpoint for real-time events
  GET  /health              - Health check

GraphQL API:
  POST /api/graphql         - GraphQL API endpoint
  GET  /api/playground      - GraphQL Playground (interactive query tool)

REST API:
  GET  /api/tests           - List test cases (supports ?runId, ?status, ?search, ?limit, ?offset)
  GET  /api/tests/{id}      - Get specific test case with steps
  GET  /api/runs            - List all test runs
  GET  /api/runs/{runId}    - Get run details with statistics