feat: add Edge exchange provider API requirements

[TaprootFreak]

Summary

• Chain & Token Identification: Add evmChainId field to AssetInDto with EvmUtil.getBlockchain() reverse lookup, enabling asset resolution via numeric EVM chain ID + contract address
• Error Handling: Add structured errors array to all quote DTOs (Buy/Sell/Swap) with Edge-compatible error codes (RegionRestricted, OverLimitError, UnderLimitError) including sourceAmountLimit/destinationAmountLimit
• Transaction Status API: Add unauthenticated GET /transaction/status/:orderId endpoint mapping 14 internal states to 6 Edge-format statuses (pending, processing, infoNeeded, expired, refunded, completed)

Changed files

File	Change
asset.dto.ts	Add evmChainId to AssetInDto, adjust validation
evm.util.ts	Add getBlockchain() reverse lookup
payment-info.service.ts	Extend resolveAsset() with evmChainId logic
quote-error.enum.ts	Add REGION_RESTRICTED, ASSET_UNSUPPORTED
structured-error.dto.ts	New DTO for structured errors
quote-error.util.ts	New utility for error mapping
buy-quote.dto.ts / sell-quote.dto.ts / swap-quote.dto.ts	Add errors field
buy.controller.ts / sell.controller.ts / swap.controller.ts	Populate errors in quote responses
transaction-status.dto.ts	New DTO + enum + mapping function
transaction.controller.ts	Add GET /transaction/status/:orderId
EDGE_REQUIREMENTS.md	Update tracking (Req 1: 70%, Req 3: 80%, Req 5: 100%)

Test plan

• Verify evmChainId in Swagger UI for AssetInDto
• Test quote endpoints with evmChainId + chainId (without blockchain)
• Verify errors array appears in Buy/Sell/Swap quote responses
• Test GET /transaction/status/:orderId with valid uid/orderUid
• Verify status mapping returns correct Edge-format status values
• Confirm backward compatibility: existing clients unaffected by new optional fields

[davidleomay]

Open points (WIP)

1. Chain and Token Identification ✅

• Done with this PR:
  • chainNetwork -> blockchain
  • tokenId -> chainId
  • chainId -> evmChainId (leave blockchain empty)

2. Order Identification and Status Page ⏳

• PR adds unnecessary endpoint
• /paymentInfos -> order UID
• Status API: https://api.dfx.swiss/v1/transaction/single?uid={order-uid}
• TODO: Status page: https://app.dfx.swiss/tx/{order-uid} must handle Q... ids unauthenticated

3. Error Handling

• TBD

4. Quoting Requirements ✅

5. Transaction Status API ✅

• https://api.dfx.swiss/v1/transaction/single?uid={uid} with order or transaction uid

6. Reporting API

• TBD

7. Account Activation ⛔

• XRP and HBAR not supported

8. Affiliate Revenue Withdrawal

• TBD

9. User Authentication

• TBD

10. Regional and Fiat Currency Support

• TBD

11. KYC Information

• TBD

12. Bank Information

• TBD

13. Verification

• TBD

14. Widgets

• TBD

15. Off-Ramp Flow

• TBD