feat: remove getWalletBalances action for deprecated /balances endpoint

[chybisov]

Which Linear task is linked to this PR?

(please link)

Why was it implemented this way?

The /wallets/{address}/balances API endpoint is being deprecated, so the getWalletBalances action (its only consumer in the SDK) is removed along with its export, client-method wrapper, and unit spec. Token balances remain fully covered by the RPC-driven getTokenBalance/getTokenBalances/getTokenBalancesByChain family, which is untouched.

Benchmarked the RPC path to confirm it can carry the full load without the endpoint: 1000 Ethereum tokens resolve in ~440 ms via a single HTTP request (viem multicall batches them into 36 eth_calls), with all spot-checked balances matching an independent RPC read at the pinned block. A 5-chain × ~1000-token sweep completes in ~2.1 s with zero failed requests, so no extra chunking configuration is needed.

Ships as a minor bump per team decision; the changeset calls out the removal so integrators see it in release notes.

Visual showcase (Screenshots or Videos)

N/A — API surface removal.

Checklist before requesting a review

• I have performed a self-review and testing of my code.
• This pull request is focused and addresses a single problem.
• If this PR modifies the SDK API or adds new features that require documentation, I have updated the documentation in the public-docs repository.

[changeset-bot]

🦋 Changeset detected

Latest commit: 73bd3c4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@lifi/sdk	Minor
@lifi/sdk-provider-bitcoin	Patch
@lifi/sdk-provider-ethereum	Patch
@lifi/sdk-provider-solana	Patch
@lifi/sdk-provider-sui	Patch
@lifi/sdk-provider-tron	Patch

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