feat: return native Solana InstructionError code in TradeError

- Simplify error code handling by directly returning Solana's native InstructionError codes
- Custom errors return their embedded code directly
- Standard InstructionError variants map to fixed codes (1-10, 999)
- Remove nested match pattern for better code readability
- Error format: buy_failed|sig={signature}|code={error_code}|msg={message}

Benefits:
- More accurate error identification using native Solana error codes
- Simpler and cleaner code structure
- Easier to maintain and extend
- Consistent with Solana ecosystem standards

src/swqos/common.rs

@@ -133,18 +133,32 @@ pub async fn poll_transaction_confirmation(
                 let ui_err = meta.err.unwrap();
                 let tx_err: TransactionError =
                     serde_json::from_value(serde_json::to_value(&ui_err)?)?;
-                let mut code = 500;
+                
+                // 直接使用Solana原生的InstructionError中的错误码
+                let mut code = 0u32;
                 let mut index = None;
                 match &tx_err {
                     TransactionError::InstructionError(i, i_error) => {
-                        match i_error {
-                            solana_sdk::instruction::InstructionError::Custom(c) => code = *c,
-                            _ => {}
-                        }
+                        // 直接匹配所有InstructionError类型，Custom也是其中之一
+                        code = match i_error {
+                            solana_sdk::instruction::InstructionError::Custom(c) => *c,
+                            solana_sdk::instruction::InstructionError::GenericError => 1,
+                            solana_sdk::instruction::InstructionError::InvalidArgument => 2,
+                            solana_sdk::instruction::InstructionError::InvalidInstructionData => 3,
+                            solana_sdk::instruction::InstructionError::InvalidAccountData => 4,
+                            solana_sdk::instruction::InstructionError::AccountDataTooSmall => 5,
+                            solana_sdk::instruction::InstructionError::InsufficientFunds => 6,
+                            solana_sdk::instruction::InstructionError::IncorrectProgramId => 7,
+                            solana_sdk::instruction::InstructionError::MissingRequiredSignature => 8,
+                            solana_sdk::instruction::InstructionError::AccountAlreadyInitialized => 9,
+                            solana_sdk::instruction::InstructionError::UninitializedAccount => 10,
+                            _ => 999, // 其他未知错误
+                        };
                         index = Some(*i);
                     }
                     _ => {}
                 }
+                
                 return Err(anyhow::Error::new(TradeError {
                     code: code,
                     message: format!("{} {:?}", tx_err, error_msg),