fixbug: gbk UnicodeEncodeError

[iorisa]

Features

• Due to the absence of a specified character set, the function for saving files used the system's default character set, gbk, to save files. However, the Unicode character "\u27f6" does not have a corresponding character in gbk, resulting in a character set conversion exception being raised.
• The modified file read/write operations now uniformly adopt the utf-8 character set. In cases where a character set exception is encountered while reading files, adaptive character set detection logic has been added.

Issue

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.18%. Comparing base (fe9dae1) to head (9d325d4).

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Additional details and impacted files

@@              Coverage Diff              @@
##           v0.7-release     #973   +/-   ##
=============================================
  Coverage         81.18%   81.18%           
=============================================
  Files               226      226           
  Lines             12482    12483    +1     
=============================================
+ Hits              10133    10134    +1     
  Misses             2349     2349           

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