fix(record): 优化获取记录表名称列表逻辑

- 将表存在性检查移至循环内，避免生成不必要的表名
- 如果表不存在，则跳过，不添加到结果列表中
- 移除了循环外的冗余表存在性检查

os-ems/src/main/java/com/os/ems/record/service/impl/RecordIotenvInstantServiceImpl.java

@@ -152,17 +152,14 @@ public class RecordIotenvInstantServiceImpl implements IRecordIotenvInstantServi
             while (!currentDate.after(endDateOnly)) {
                 String tableSuffix = tableFormat.format(currentDate);
                 String tableName = "record_iotenv_instant_" + tableSuffix;
-                tableNames.add(tableName);
+                if (isTableExists(tableName)){
+                    tableNames.add(tableName);
+                }
                 // 日期加1天
                 calendar.setTime(currentDate);
                 calendar.add(Calendar.DAY_OF_MONTH, 1);
                 currentDate = calendar.getTime();
             }
-            for (String tableName : tableNames){
-                if (!isTableExists(tableName)){
-                    return new ArrayList<>();
-                }
-            }
 
         return tableNames;
     }