Vcwallet LTC audit build 0.8.0

Checks/fixes made:
- Correct CompactSize script lengths on inputs and outputs.
- Correct P2PKH scriptSig construction.
- Local ECDSA signature self-verification before broadcast.
- Local raw transaction structural parser before broadcast.
- Confirmed/validated UTXO filtering and deterministic largest-first selection.
- Fee re-estimation and conservative dust/change handling.
- Correct handling of plain-text, JSON-string, and JSON-object TXID responses.
- Balance includes mempool funded/spent deltas so pending sends do not appear spendable.
- Real send path is Litecoin-only; simulated asset sends are disabled.
- Per-account LTC storage/key names were preserved.
- Removed stale Solana Devnet runtime hookup and manifest permission.

This is experimental self-custody software and is not a guarantee against loss. Back up the Litecoin WIF before using mainnet funds.
