feat: 移除不必要的 toastController 导入，优化密码修改成功提示逻辑

auto-imports.d.ts

@@ -451,7 +451,6 @@ 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 showSuccessToast: UnwrapRef<typeof import('vant/es')['showSuccessToast']>
     readonly showToast: UnwrapRef<typeof import('vant/es')['showToast']>
     readonly storeToRefs: UnwrapRef<typeof import('pinia')['storeToRefs']>
     readonly syncRef: UnwrapRef<typeof import('@vueuse/core')['syncRef']>