[Feature Request] Add File Encoding Conversion Support When Adding Context and Applying Diffs

[liuyu80]

Suggest adding encoding conversion functionality when reading and editing files. Specific requirements:

• Automatically detect source file encoding format (e.g. convert GB2312 to UTF-8) when reading files to add context
• Convert text blocks to match the file's original encoding type (e.g. convert UTF-8 back to GB2312) when editing files

Thank you for considering this enhancement! It would significantly improve handling projects with mixed encoding standards.🌈