refactor: use Nuxt 4 directory structure

app/utils/prompt.ts

@@ -0,0 +1,14 @@
+import type { ResearchFeedbackResult } from '~/components/ResearchFeedback.vue'
+import type { ResearchInputData } from '~/components/ResearchForm.vue'
+
+export function getCombinedQuery(
+  form: ResearchInputData,
+  feedback: ResearchFeedbackResult[],
+) {
+  return `Initial Query: ${form.query}
+Follow-up Questions and Answers:
+${feedback
+  .map((qa) => `Q: ${qa.assistantQuestion}\nA: ${qa.userAnswer}`)
+  .join('\n')}
+  `
+}