* refactor: update package name and version, improve code comments
Update package name from 'z-ai' to 'z-ai-sdk' and version to 0.0.1a1
Improve code comments in CodeGeexParams by making them more concise and moving attribute docs inline
* docs(code_geex): improve type docstrings for better clarity
Move docstrings from inline comments to class-level and add attributes section
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Co-authored-by: zhengweijun <weijun.zheng@aminer.cn>