fix(frontend) : add missing useTaskDocumentService imports

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/task/TaskDocumentUpload.vue

@@ -44,6 +44,8 @@
 </template>
 
 <script setup lang="ts">
+import { useTaskDocumentService } from '~/services/task-documents'
+
 const props = defineProps<{
     taskId: number
 }>()