chore: bump version to v3.5.0 and update roadmap

Version Changes:
- Update version to 3.5.0 in package.json, Cargo.toml, and tauri.conf.json

Changelog Updates:
- Add v3.5.0 release notes with comprehensive feature list
- Document MCP management system implementation
- Document configuration import/export functionality
- Document endpoint speed testing feature
- List all improvements, bug fixes, and technical enhancements

Roadmap Updates:
- Mark MCP manager as completed ✅
- Mark i18n (internationalization) as completed ✅
- Add new planned features: memory management, cloud sync
- Reorganize feature priorities

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cc-switch"
-version = "3.4.0"
+version = "3.5.0"
 description = "Claude Code & Codex 供应商配置管理工具"
 authors = ["Jason Young"]
 license = "MIT"