minor fixes

src/core/client.py

@@ -3,12 +3,11 @@ Solana client abstraction for blockchain operations.
 """
 
 import asyncio
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import Any, Dict
 
 from solana.rpc.async_api import AsyncClient
 from solana.rpc.commitment import Confirmed
 from solana.rpc.types import TxOpts
-from solders.instruction import Instruction
 from solders.keypair import Keypair
 from solders.pubkey import Pubkey
 from solders.transaction import Transaction