Feature Request: Add a health-check endpoint for node synchronization status

[SoySkate]

Hi, I was looking into monitoring a RustChain node and I noticed it would be incredibly helpful to have a dedicated /api/sync-status or /health/sync endpoint that simply returns:

{ "is_synced": true, "current_block": 10425, "network_block": 10425 }

This would make it much easier to integrate RustChain nodes with standard infrastructure monitoring tools like Prometheus or Datadog without having to parse logs.

(Also, claiming the 1 RTC bounty for opening a meaningful feature request on Scottcjn repos! Wallet: 0xC2C9225C4d45e3A742eE8b5DBcBf2d7a166b6Fef)

[github-actions]

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