[M4] Replace sample routes with protocol-compliant HTTP + SSE service #11
Description
Description
Rework sample service routes from echo/demo style to production-like protocol routing aligned with MCP sample quality.
Tasks
- Add JSON-RPC HTTP route with envelope/method dispatch/error handling.
- Add SSE stream/subscribe routes.
- Add health and diagnostics endpoints.
- Provide curl examples for each implemented method.
Acceptance Criteria
- Sample service demonstrates full supported protocol flow.
- Routes are documented and runnable from README.
- Manual smoke test checklist passes.
Dependencies
- Issues 4, 6, 8, 10