RobotWebTools / rclnodejs / 35493048849

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[Web runtime] Add HTTP SSE action support (3/3) (#1598)

- Add HTTP action goal endpoints streaming accepted, feedback, result, and error events over SSE.
- Share SSE headers, framing, heartbeats, and cleanup between dedicated subscription and action connection classes, using consistent request/response naming.
- Support actions in HTTP-only clients while preserving WebSocket routing for explicitly configured HTTP/WS endpoint pairs.
- Abort pending HTTP action requests and streams on client close, suppress late feedback, and reject results when streams end prematurely.
- Handle LF, CRLF, CR, and mixed SSE line endings across response chunk boundaries.
- Preserve terminal action status and document that HTTP cancellation is unsupported and disconnecting does not cancel ROS goals.
- Extend OpenAPI with action goal, feedback, result, and rejection schemas, plus a shared JSON error schema for pre-stream failures.
- Clarify that action response schemas describe individual SSE event payloads and that generic OpenAPI clients require SSE-aware parsing.
- Update CLI transport reporting and TypeScript documentation.
- Expand HTTP/SSE action and subscription lifecycle, SDK shutdown, stream parsing, and OpenAPI regression coverage.
- Retry ROS setup once on Linux x64 and ARM64 for Humble, Jazzy, and Kilted, skipping retries on cancellation and keeping repeated failures fatal.

Fix: #1579

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