项目管理界面显示异常优化

frontend/src/views/admin/Projects.vue

@@ -25,7 +25,9 @@
             <el-tag :type="statusTag(scope.row.status)">{{ statusLabel(scope.row.status) }}</el-tag>
           </template>
         </el-table-column>
-        <el-table-column prop="created_at" label="创建时间" width="200" />
+        <el-table-column prop="created_at" label="创建时间" width="200">
+          <template #default="scope">{{ displayDateTime(scope.row.created_at) }}</template>
+        </el-table-column>
         <el-table-column label="操作" width="320" fixed="right">
           <template #default="scope">
             <el-button link type="primary" size="small" @click="openEdit(scope.row)">编辑</el-button>
@@ -48,6 +50,7 @@ import { fetchStudies } from "../../api/studies";
 import type { Study } from "../../types/api";
 import ProjectForm from "./ProjectForm.vue";
 import { useStudyStore } from "../../store/study";
+import { displayDateTime } from "../../utils/display";
 
 const projects = ref<Study[]>([]);
 const loading = ref(false);