Display current auction price for GA

[pyropy]

Context

Per the GA scope defined in XFN-221, Filecoin Pay Auction needs visibility into:

2. Current auction price

Acceptance Criteria

• Display the current auction price
• Can be a static number (charts can come post-GA)

Notes

For GA, these can be static numbers. How to report these static numbers is up for eng to decide - grafana, pay.filecoin.cloud, observable, or a static website are all valid options.

References

• GA Scope: https://linear.app/filoz/issue/XFN-221/filecoin-pay-ga-scope
• Parent issues:
  • Fee auction monitoring tools #251
  • Dashboard on FP auction metric for GA #279