chore(release): bump version to v3.7.0 and rebrand to include Gemini CLI

- Update version from 3.6.2 to 3.7.0 across all config files
- Update project description to "All-in-One Assistant for Claude Code, Codex & Gemini CLI"
- Update Chinese description to "Claude Code / Codex / Gemini CLI 全方位辅助工具"
- Sync version in package.json, Cargo.toml, tauri.conf.json
- Update branding in README.md, README_ZH.md and i18n locale files

README_ZH.md

@@ -1,8 +1,8 @@
 <div align="center">
 
-# Claude Code & Codex 供应商管理器
+# Claude Code / Codex / Gemini CLI 全方位辅助工具
 
-[![Version](https://img.shields.io/badge/version-3.6.1-blue.svg)](https://github.com/farion1231/cc-switch/releases)
+[![Version](https://img.shields.io/badge/version-3.7.0-blue.svg)](https://github.com/farion1231/cc-switch/releases)
 [![Trending](https://img.shields.io/badge/🔥_TypeScript_Trending-Daily%20%7C%20Weekly%20%7C%20Monthly-ff6b6b.svg)](https://github.com/trending/typescript)
 [![Platform](https://img.shields.io/badge/platform-Windows%20%7C%20macOS%20%7C%20Linux-lightgrey.svg)](https://github.com/farion1231/cc-switch/releases)
 [![Built with Tauri](https://img.shields.io/badge/built%20with-Tauri%202-orange.svg)](https://tauri.app/)
@@ -43,7 +43,7 @@ CC Switch 已经预设了智谱GLM，只需要填写 key 即可一键导入编
 
 ## 功能特性
 
-### 当前版本：v3.6.2 | [完整更新日志](CHANGELOG.md)
+### 当前版本：v3.7.0 | [完整更新日志](CHANGELOG.md)
 
 **核心功能**