adjust logic, avoide race condition

play-admin/src/main/java/com/starry/admin/modules/withdraw/service/impl/WithdrawalServiceImpl.java

@@ -57,13 +57,12 @@ public class WithdrawalServiceImpl extends ServiceImpl<WithdrawalRequestMapper,
             throw new CustomException("收款码确认已过期，请重新确认");
         }
 
-        BigDecimal available = earningsService.getAvailableAmount(clerkId, now);
-        if (available.compareTo(amount) < 0) {
-            throw new CustomException("可提现余额不足");
-        }
         // pick and reserve lines
         List<EarningsLineEntity> lines = earningsService.findWithdrawable(clerkId, amount, now);
-        if (lines.isEmpty()) throw new CustomException("可提现余额不足");
+        if (lines.isEmpty()) {
+            BigDecimal latestAvailable = earningsService.getAvailableAmount(clerkId, now);
+            throw new CustomException("可提现余额不足或已被锁定，当前可用：" + latestAvailable);
+        }
 
         // Reserve lines FIRST with temp ID (fail fast before creating request)
         String tempWithdrawalId = "TEMP_" + IdUtils.getUuid();