[fees]stableflow - add fees adapter for stableflow

[DarkLord017]

Resolves #4786

Stableflow uses the following bridging services:

• USDT0 / FraxZero – Directly interacts with the respective on-chain contracts. Any fees charged are protocol fees (e.g. LayerZero) and are not collected by Stableflow.

• NEAR Intents – Charges a 1 basis point (0.01%) affiliate fee, which is paid to referrer.near.

• CCTP – Charges protocol fees such as the mint fee and bridge fee. These fees belong to CCTP and are not collected by Stableflow.

• Native Transfers – Stableflow currently does not charge any affiliate fee for native transfers.

Source - https://github.com/stableflow-ai/stableflow-interface

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[github-actions]

The stableflow adapter exports:

> adapters@1.0.0 test
> ts-node --transpile-only cli/testAdapter.ts fees stableflow

🦙 Running STABLEFLOW adapter 🦙
---------------------------------------------------
Start Date:	Sun, 12 Jul 2026 00:00:00 GMT
End Date:	Mon, 13 Jul 2026 00:00:00 GMT
---------------------------------------------------

------ ERROR ------
Error: DUNE_API_KEYS environment variable is not set
    at getAxiosDune (/home/runner/work/dimension-adapters/dimension-adapters/helpers/dune.ts:17:11)
    at submitQuery (/home/runner/work/dimension-adapters/dimension-adapters/helpers/dune.ts:81:33)
DUNE_API_KEYS environment variable is not set

[github-actions]

The stableflow adapter exports:

> adapters@1.0.0 test
> ts-node --transpile-only cli/testAdapter.ts fees stableflow

🦙 Running STABLEFLOW adapter 🦙
---------------------------------------------------
Start Date:	Sun, 12 Jul 2026 00:00:00 GMT
End Date:	Mon, 13 Jul 2026 00:00:00 GMT
---------------------------------------------------

------ ERROR ------
Error: DUNE_API_KEYS environment variable is not set
    at getAxiosDune (/home/runner/work/dimension-adapters/dimension-adapters/helpers/dune.ts:17:11)
    at submitQuery (/home/runner/work/dimension-adapters/dimension-adapters/helpers/dune.ts:81:33)
DUNE_API_KEYS environment variable is not set