chore: bump keyring API dependencies (Batch accounts 1/5)

[gantunesr]

Stack part 1 of 5 split from #601. This PR only bumps the keyring API dependencies needed for batch account creation and updates the lockfile. No behavior changes are intended.

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Note

Medium Risk
Primarily dependency upgrades (major versions) for keyring/snaps packages, which could introduce breaking API or runtime behavior changes even though local code changes are mostly type/import adjustments.

Overview
Updates dependency versions to @metamask/keyring-api@^22.0.0, @metamask/keyring-snap-sdk@^8.0.0, and pins @metamask/snaps-sdk to ^11.0.0 (plus lockfile updates), with changelog entries for site and snap.

Refactors snap types so CurrencyRate is defined in entities/currency.ts and consumers import it from local entities instead of @metamask/snaps-sdk, adjusting related imports in confirmation/send-flow/format and repositories/use-cases.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​metamask/​keyring-api@​21.3.0 ⏵ 22.0.0				-1
	@​metamask/​keyring-snap-sdk@​7.1.1 ⏵ 8.0.0	+1		+1
	@​metamask/​utils@​11.9.0 ⏵ 11.11.0			+1

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