feat: 更新 showToast 显示逻辑，添加错误代码上下文；更新语言存储键以包含应用版本

auto-imports.d.ts

@@ -450,7 +450,6 @@ declare module 'vue' {
     readonly shallowReactive: UnwrapRef<typeof import('vue')['shallowReactive']>
     readonly shallowReadonly: UnwrapRef<typeof import('vue')['shallowReadonly']>
     readonly shallowRef: UnwrapRef<typeof import('vue')['shallowRef']>
-    readonly showToast: UnwrapRef<typeof import('vant/es')['showToast']>
     readonly storeToRefs: UnwrapRef<typeof import('pinia')['storeToRefs']>
     readonly syncRef: UnwrapRef<typeof import('@vueuse/core')['syncRef']>
     readonly syncRefs: UnwrapRef<typeof import('@vueuse/core')['syncRefs']>