Remove unused imports and variables (S1128, S1481, S1854)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/views/Upload/UploadPage.vue

@@ -173,8 +173,6 @@ import { useRouter } from "vue-router";
 import { storeToRefs } from "pinia";
 import { useLoadingStore } from "@/stores/loading";
 import {
-  uploadFailedFirst,
-  uploadSuccess,
   uploadConfirm,
 } from "@/module/alertModal.js";