Current NAV of bound wallets, by address (fan-out)

Resolve the given owned addresses to the caller org's bound wallets and return per-provider NAV in ONE call — no wallet id needed. Pass `walletAddress` (repeatable): each address resolves ALL of its bindings, so a user's HL + PM addresses come back together, and a single address bound under both providers returns both. Each `slices[i]` is the SAME shape as `GET /v1/me/wallets/{id}/nav` (identical numbers); an address bound under nothing lands in `warnings` (bind first via POST /v1/me/wallets). For arbitrary/unbound addresses' CURRENT value use `/v1/portfolio` instead.