Simplify dashboard monitor metrics payload and switch stats sampling to /stats?blocks=100

[Copilot]

This update aligns monitor output with current chart ingestion expectations: metric meta is no longer emitted, and stats are now sourced from the REST endpoint using a fixed 100-block window instead of the prior 24hr-style call.

• Stats source window update

  • In dashboard/monitor/monitor.go, collectMetrics() now fetches:
    • "/stats?blocks=100"
  • Replaces the previous "/stats24" call path.

• Payload schema simplification

  • Removed meta from submitted stats_* and smpv_* metric objects.
  • Deleted the now-unused sampleMeta(...) helper and its callsite.
  • Metric keys and value fields remain unchanged.

• Repo hygiene

  • Added root/pkg/mod/cache/lock to .gitignore to avoid committing local Go module cache lock artifacts.

// before
statsStr, err := fetchEndpoint(fmt.Sprintf("/stats24"))
"stats_tps": map[string]interface{}{"value": mustParseFloat(stats["tps"]), "meta": tsmeta},

// after
statsStr, err := fetchEndpoint("/stats?blocks=100")
"stats_tps": map[string]interface{}{"value": mustParseFloat(stats["tps"])},

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