- Replace httpx.Client with aitbc.AITBCHTTPClient in BitcoinWallet class
- Remove HTTP_CLIENT_AVAILABLE check and httpx import guard
- Replace logging.getLogger with aitbc.get_logger in bitcoin_wallet.py
- Migrate explorer.py from httpx to aitbc.AITBCHTTPClient
- Add NetworkError exception handling in explorer service
- Remove async context manager and status code checks in favor of AITBCHTTPClient
- Remove httpx imports from both services
- Consistent