refactor: improve date handling and timezone consistency

- Add timezone support to database module (+08:00)
- Extract date formatting utilities to shared modules
- Standardize timezone handling across frontend and backend
- Improve date formatting consistency in UI components
- Refactor crawler page.goto options for better readability

frontend/src/components/PinnedProject.vue

@@ -38,7 +38,7 @@
         <el-table-column prop="source" label="来源" width="200" />
         <el-table-column prop="publishDate" label="发布日期" width="180">
           <template #default="scope">
-            {{ formatDate(scope.row.publishDate) }}
+            {{ formatSimpleDate(scope.row.publishDate) }}
           </template>
         </el-table-column>
       </el-table>
@@ -51,6 +51,7 @@ import { ref, onMounted } from 'vue'
 import api from '../utils/api'
 import { ElMessage } from 'element-plus'
 import { Loading, InfoFilled, Paperclip } from '@element-plus/icons-vue'
+import { formatSimpleDate } from '../utils/date.util'
 
 const emit = defineEmits<{
   pinChanged: [title: string]
@@ -88,16 +89,6 @@ const togglePin = async (item: any) => {
   }
 }
 
-// 格式化日期，只显示年月日
-const formatDate = (dateStr: string) => {
-  if (!dateStr) return ''
-  const date = new Date(dateStr)
-  const year = date.getFullYear()
-  const month = String(date.getMonth() + 1).padStart(2, '0')
-  const day = String(date.getDate()).padStart(2, '0')
-  return `${year}-${month}-${day}`
-}
-
 // 初始化时加载置顶项目
 onMounted(() => {
   loadPinnedBids()