debug: add logging for 'to' field to diagnose issue

apps/blockchain-node/src/aitbc_chain/rpc/router.py

@@ -205,7 +205,7 @@ def _serialize_receipt(receipt: Receipt) -> Dict[str, Any]:
 class TransactionRequest(BaseModel):
     type: str = Field(description="Transaction type, e.g. TRANSFER, RECEIPT_CLAIM, GPU_MARKETPLACE, EXCHANGE, MESSAGE")
     sender: str = Field(alias="from")  # Accept both "sender" and "from"
-    to: str = Field(description="Recipient address (required for TRANSFER)")
+    recipient: str = Field(alias="to")  # Accept both "recipient" and "to"
     nonce: int
     fee: int = Field(ge=0)
     payload: Dict[str, Any]
@@ -329,6 +329,8 @@ async def submit_transaction(tx_data: TransactionRequest) -> Dict[str, Any]:
         }
         
         _logger.info(f"tx_data.to: {tx_data.to}, tx_data_dict['to']: {tx_data_dict['to']}")
+        _logger.info(f"tx_data.to is None: {tx_data.to is None}")
+        _logger.info(f"tx_data.payload.get('to') is None: {tx_data.payload.get('to') is None}")
         
         _logger.info(f"Initial tx_data_dict amount: {tx_data_dict['amount']}")