fix(wallet): resolve saved asset-lock keys through platform-wallet

[lklimek]

TL;DR

Funding a Platform address from a saved deposit now works when the wallet owns its signing key but the address is absent from DET's local address list.

User story

As a wallet user, I can reuse an existing funding deposit without a misleading missing-address error.

Scenario

In Wallets → Dash Core → Asset Locks, choose Fund for an unused deposit and a destination outside the upstream wallet address pool. Previously this could fail despite a valid funding proof. The deposit can now fund the destination. Deposits reserved for DashPay invitations are rejected before signing.

Detailed discussion

Stacked on #1028 (fix/orphaned-tx). No dependency pin changes.

The manual funding path now resolves the tracked outpoint through resume_asset_lock, derives the returned funding-account path, and signs inside one wallet-backend secret session. It no longer relies on Wallet::known_addresses for the credit-output key or accesses seed material in the backend task.

Validation:

• Existing TC-018 reproduced AssetLockAddressNotFound before the fix with known_locally=false and a proof present.
• Live testnet TC-018 passed (1 executed, 92 filtered); it explicitly removes the credit address from the legacy cache before funding.
• Invitation guard test passed, covering rejection of invitation vouchers and acceptance of the five other funding types.
• cargo fmt --all -- --check, scoped Clippy (--locked --test backend-e2e --all-features -- -D warnings), and git diff --check passed.

The non-pool SDK submission retains its existing consumption/retry behavior; this change fixes key resolution. The independent SQLite wallet_restore reconciliation error is fixed separately in dashpay/platform#5207 and integrated into DET by #1036. This is a draft, so automatic PR CI is suppressed.

_{🤖 Co-authored by Claudius the Magnificent AI Agent}

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[thepastaclaw]

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Commit 9cf5456. Normal review starts when eligible; priority review starts as soon as a slot is available.