Add an endpoint returning a full on-chain state snapshot for a key for debugging and reconciliation

[Chucks1093]

Summary

When debugging discrepancies between on-chain and database state, operators need a way to see exactly what the contract holds for a given key without writing a separate script. A GET /admin/keys/:keyId/snapshot endpoint that reads all relevant on-chain fields via the Soroban RPC and returns them alongside the corresponding database values would simplify reconciliation.

Scope

• Add GET /admin/keys/:keyId/snapshot requiring a valid admin JWT
• Read circulatingSupply, currentPrice, holderCount, tradingPaused, supplyCap, holderCapBps, and circuitBreakerThresholdBps from the Soroban contract
• Read the same fields from the database key record
• Return both sets side by side with a drift boolean per field indicating whether they match
• Return 404 for unknown key IDs

Acceptance Criteria

• All specified on-chain fields read and returned
• Corresponding database fields returned alongside each on-chain value
• drift field correctly true when values differ and false when they match
• Non-admin JWT returns 403
• 404 returned for unknown key ID

ETA: 12 hours

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Coordinate on Telegram

[Preciousuche]

I want to work on this.