解决pg-error问题，demo数据注入

frontend/src/components/SubjectForm.vue

@@ -23,7 +23,6 @@
 
 <script setup lang="ts">
 import { computed, reactive, ref } from "vue";
-import { format } from "date-fns";
 import type { FormInstance, FormRules } from "element-plus";
 import { ElMessage } from "element-plus";
 import { createSubject } from "../api/subjects";
@@ -68,7 +67,7 @@ const resetForm = () => {
   const recentSubject = studyId ? localStorage.getItem(`recent_subject_${studyId}`) : null;
   form.site_id = recentSite || "";
   form.subject_no = recentSubject || "";
-  form.screening_date = format(new Date(), "yyyy-MM-dd");
+  form.screening_date = new Date().toISOString().slice(0, 10);
 };
 
 const onSubmit = async () => {