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.lock

@@ -563,7 +563,7 @@ dependencies = [
 
 [[package]]
 name = "cc-switch"
-version = "3.4.0"
+version = "3.5.0"
 dependencies = [
  "chrono",
  "dirs 5.0.1",

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"

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",