Update README

Keep README.md (English, primary) and README.zh-CN.md (Simplified Chinese, secondary) in sync with the project's actual current state. Both files must be accurate, complete, and consistent with each other.

Header Format (Required)

Every README must open with this exact structure — adapt the badges, project name, and description to the project at hand:

# <Project Name> ![](https://img.shields.io/badge/<label>-<message>-<color>)

[![<Badge1 Label>](<badge-url>)](<link>) [![<Badge2 Label>](<badge-url>)](<link>)

**English** | [简体中文](README.zh-CN.md)

For README.zh-CN.md, reverse the language toggle: