feat(i18n): Add i18n infrastructure and Chinese translations

- Add vue-i18n dependency and i18n plugin
- Create English and Chinese translation files (en.json, zh.json)
- Add Vuetify Chinese locale support
- Configure i18n with fallback locale and locale persistence

Author: norulers

package.json

@@ -85,6 +85,7 @@
     "vue": "^3.4.21",
     "vue-draggable-plus": "^0.2.0-beta.2",
     "vue-draggable-resizable": "3.0.0",
+    "vue-i18n": "9",
     "vue-router": "^4.0.14",
     "vue-virtual-scroller": "^2.0.0-beta.8",
     "vue3-slider": "^1.9.0",