update lending contract

contracts/ytLending/Lending.sol

@@ -63,7 +63,6 @@ contract Lending is
         
         // 设置其他参数
         storeFrontPriceFactor = config.storeFrontPriceFactor;
-        trackingIndexScale = config.trackingIndexScale;
         baseBorrowMin = config.baseBorrowMin;
         targetReserves = config.targetReserves;
         
@@ -268,49 +267,6 @@ contract Lending is
         emit WithdrawCollateral(msg.sender, msg.sender, asset, amount);
     }
 
-    /**
-     * @notice 借款
-     * @dev baseBorrowMin 是用户借款的最小金额，如果用户借款后，余额小于 baseBorrowMin（由正数变为负数同理），则抛出 BorrowTooSmall 错误
-     */
-    function borrow(uint256 amount) external override nonReentrant whenNotPaused {
-        accrueInterest();
-        
-        // 获取用户当前本金
-        UserBasic memory user = userBasic[msg.sender];
-        int104 oldPrincipal = user.principal;
-        
-        // 计算当前实际余额（含利息）
-        uint256 index = oldPrincipal >= 0 ? supplyIndex : borrowIndex;
-        int256 oldBalance = LendingMath.principalToBalance(oldPrincipal, index);
-        
-        // 计算新余额（减去借款额）
-        int256 newBalance = oldBalance - int256(amount);
-        
-        // 检查最小借款额
-        if (newBalance < 0 && uint256(-newBalance) < baseBorrowMin) revert BorrowTooSmall();
-        
-        // 转换为新本金（新状态可能从存款变为借款）
-        uint256 newIndex = newBalance >= 0 ? supplyIndex : borrowIndex;
-        int104 newPrincipal = LendingMath.balanceToPrincipal(newBalance, newIndex);
-        
-        // 计算提取和借款金额
-        (uint104 withdrawAmount, uint104 borrowAmount) = LendingMath.withdrawAndBorrowAmount(oldPrincipal, newPrincipal);
-        
-        // 更新全局状态
-        totalSupplyBase -= withdrawAmount;
-        totalBorrowBase += borrowAmount;
-        
-        // 更新用户本金，方便检查更新后的用户本金是否大于还是小于抵押品价值
-        userBasic[msg.sender].principal = newPrincipal;
-        
-        // 检查抵押品是否充足  
-        if (!_isSolvent(msg.sender)) revert InsufficientCollateral();
-        
-        IERC20(baseToken).safeTransfer(msg.sender, amount);
-        
-        emit Withdraw(msg.sender, msg.sender, amount);
-    }
-
     /**
      * @notice 清算不良债务（内部实现）
      * @dev 当用户抵押品由于乘以liquidateCollateralFactor后，小于债务价值时，会进行清算，清算后，如果实际抵押品价值乘以liquidateCollateralFactor大于债务价值，则将差额部分作为用户本金（本金以baseToken显示），否则将差额部分作为坏账，由协议承担
@@ -338,7 +294,7 @@ contract Lending is
                 AssetConfig memory assetConfig = assetConfigs[asset];
                 uint256 assetPrice = IYTLendingPriceFeed(lendingPriceSource).getPrice(asset);
                 
-                // 计算抵押品价值（USD，8位精度）- 用于事件记录
+                // 计算抵押品价值-用于事件记录
                 uint256 assetScale = 10 ** assetConfig.decimals;
                 uint256 collateralValueUSD = (collateralAmount * assetPrice) / assetScale;