feat(ramps): add NeoBankService Pix and quote client methods

[saustrie-consensys]

Explanation

Stacked on #9848 (cursor/ramps-autoramp-accounts). That PR's NeoBankService only exposes getAutoramp. Pix send needs additional HTTP clients against the neo-bank proxy, using the same bearer auth, createServicePolicy, and messenger exposure patterns.

This PR adds messenger-backed methods for Pix address registration, autoramp quote fetch/create/attach, and customer lookup. Paths use the live neobank-proxy global /neobank prefix on the on-ramp.api host (not /api/v2/...), and getAutoramp is updated to GET /neobank/autoramps/{id} so Core matches the proxy that ships.

Pix/quote helpers return parsed proxy JSON (transparent forwarding; MoonPay schemas are not over-modeled). createAutoramp maps autoramp-shaped responses via mapNeoBankAutorampToRemoteSnapshot, matching getAutoramp. Optional Idempotency-Key is supported on mutating calls.

Does not implement RampsController:sendPix, TransactionPayController, or Mobile wiring.

References

• Depends on / stacks on feat(ramps): add autoramp accounts, NeoBankService, and User Storage sync #9848
• Aligns Core paths with neobank-proxy /neobank prefix (mmcx-onramp-api Support watching assets on a specific account #1124 and related Pix/quote proxy work)

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