Mirror the laravel-ethereum API: importWallet/generateWallet/newWallet/
createWallet and createAddress/newAddress accept a $derivationPath template
with an {index} placeholder. Adds Tron::PATH_BIP44, resolveDerivationPath/
validateDerivationPath, a tron.wallet.default_derivation_path config key and
a derivation_path column on tron_wallets. Default path keeps existing
addresses unchanged (derive(full path) == derive(account)->deriveChild(index)).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>