fix(monero): resolve balance/history across HD wallet indices

[Thorian1te]

Summary

PR3 of the Monero wallet-rpc hardening stack (stacks on #1766 → #1765):

• Resolve getBalance / getTransactions / getWalletBalanceDetail addresses to HD walletIndex 0–20
• Each index opens its own wallet-rpc file (xchain-${addressPrefix}) — already how prepareWalletRpc worked for transfer({ walletIndex })
• LWS + daemon-scan fallbacks use the matching index’s view/spend keys
• Daemon scan cache is keyed by walletIndex so index 0 and 1 do not mix outputs

Test plan

• Unit tests including non-zero index wallet-rpc open (132 passed)
• yarn build --filter=@xchainjs/xchain-monero

Stack

1. fix(monero): harden address, purge, and unlocked balance #1765 — address / purge / unlocked
2. fix(monero): quarantine broadcastTx and map fee priorities #1766 — broadcastTx / fee priority
3. This PR — multi-index rpc parity
4. (next) stagenet spend e2e

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