perf(web3): add multicall batching via ethers-multicall-utils

[YoshiyukiSakura]

Replaces manual Promise.all batching with ethers-multicall-utils, a lightweight multicall utility.

No breaking changes.

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Latest commit: 17c2e19

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update the lockfile with the new dependency

Because this adds ethers-multicall-utils to the root workspace manifest but leaves yarn.lock unchanged, clean CI installs are no longer reproducible: the shared setup action and Expo workflow both run yarn install --immutable, which rejects manifest/lockfile drift before build or tests run. I checked yarn.lock and the root ak-rn-monorepo@workspace:. entry still has no ethers-multicall-utils dependency, so this needs a regenerated lockfile entry.

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