chore: bump version to 3.4.0

- Add i18next internationalization with Chinese/English support
- Add Claude plugin sync alongside VS Code integration
- Extend provider presets with new models (DeepSeek-V3.2-Exp, Qwen3-Max, GLM-4.6)
- Support portable mode and single instance enforcement
- Add tray minimize and macOS Dock visibility management
- Improve Settings UI with scrollable layout and save icon
- Fix layout shifts and provider toggle consistency
- Remove unnecessary OpenAI auth requirement
- Update Windows MSI installer to target per-user LocalAppData

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.3.1",
+  "version": "3.4.0",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",