- Add check for SSE ping messages from fastMCP server
- Log debug message when ping received instead of throwing exception
- Complete the stream on ping events
- Matches behavior of Python SDK which treats pings as keep-alive

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- Strengthen the logic for detecting SSE ping comments by checking that id, event, and data fields are empty.
- Generalize comment detection into isCommentLine(ServerSentEvent) for clarity and reusability.
- Improves consistency with the SSE specification and matches behavior of the Python SDK.
- Replaces previous hardcoded check with a more robust and maintainable solution.