feat(ramps-controller): send MetaMask client identity on on-ramp fetches

[amitabh94]

Explanation

UB2 catalog gating needs product, app SemVer, and RC vs store on every on-ramp request. Other product APIs already send x-metamask-clientproduct / x-metamask-clientversion; Client Config uses environment as a query. This PR adds optional constructor fields on RampsService and TransakService and sends all three as headers.

controller stays the ramps-controller package version (JWT). clientEnvironment is a flag dimension (prod / rc / exp / dev / …), not an API-host switch.

NeoBankService / WalletRegistrationService are not on main yet. Those callers should get the same options when they land.

References

• Related to UB2 client metadata / catalog gating
• Consumer: MetaMask Mobile feat: send UB2 client identity on ramps API requests metamask-mobile#35273
• API: https://github.com/consensys-vertical-apps/va-mmcx-onramp-api/pull/1138

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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