分页,sheet表头,字典,数据格式

分页导出能否再简洁写，可以参数调用，现在需要自己实现分页，以及数据量大的单sheet不行，能否传参自动实现20w一个sheet；
sheet表头只支持首个，多个sheet时不支持自定义
导入导出的数据库字典映射能否支持，如 1=成功
数据格式丰富下，数值格式等

The issue names no files, tests, or entry points. Start by separating the requests for pagination, multi-sheet headers, database dictionary mapping, and richer numeric formats, then locate the existing import and export APIs for each area. Done should be defined as agreed behavior and tests for the selected scope, including large exports and multiple sheets where applicable.

Written by the indexing model from the issue text.