fix: include BlockchainIdentities accounts in find_address_account() lookup

[Copilot]

ManagedCoreAccount::find_address_account() was blind to all four blockchain_identities_* account variants, causing address-to-account lookups to return None for any DIP-9 identity paths.

Changes

• account_checker.rs: Added checks for blockchain_identities_ecdsa, blockchain_identities_ecdsa_hash160, blockchain_identities_bls, and blockchain_identities_bls_hash160 in find_address_account(), consistent with the existing Option<Account> singleton pattern used for identity_registration etc.

if let Some(account) = &collection.blockchain_identities_ecdsa {
    if account.contains_address(address) {
        return Some((AccountTypeToCheck::BlockchainIdentitiesECDSA, None));
    }
}
// ... repeated for _ecdsa_hash160, _bls, _bls_hash160

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[Copilot]

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