feat: 添加投标信息按日期范围更新功能及AI推荐持久化

添加按日期范围更新投标信息的功能，支持日期范围选择和数据更新
实现AI推荐结果的持久化存储和加载功能
优化日期范围选择器的本地存储功能

frontend/src/components/Dashboard-AI.vue

@@ -106,7 +106,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, watch } from 'vue'
 import axios from 'axios'
 import { ElMessage } from 'element-plus'
 import { MagicStick, Loading, InfoFilled, List } from '@element-plus/icons-vue'
@@ -132,6 +132,37 @@ const showAllBids = ref(false)
 const bidsLoading = ref(false)
 const bidsByDateRange = ref<any[]>([])
 
+// 从 localStorage 加载保存的日期范围
+const loadSavedDateRange = () => {
+  const saved = localStorage.getItem('dashboardAI_dateRange')
+  if (saved) {
+    try {
+      dateRange.value = JSON.parse(saved)
+    } catch (e) {
+      console.error('Failed to parse saved date range:', e)
+    }
+  }
+}
+
+// 监听日期范围变化并保存到 localStorage
+watch(dateRange, (newDateRange) => {
+  localStorage.setItem('dashboardAI_dateRange', JSON.stringify(newDateRange))
+}, { deep: true })
+
+// 从数据库加载最新的 AI 推荐
+const loadLatestRecommendations = async () => {
+  try {
+    const response = await axios.get('/api/ai/latest-recommendations')
+    aiRecommendations.value = response.data
+  } catch (error) {
+    console.error('Failed to load latest recommendations:', error)
+  }
+}
+
+// 初始化时加载保存的日期范围和最新的 AI 推荐
+loadSavedDateRange()
+loadLatestRecommendations()
+
 // 设置日期范围为最近3天
 const setLast3Days = () => {
   const endDate = new Date()
@@ -181,7 +212,7 @@ const fetchAIRecommendations = async () => {
     })
 
     // 根据 title 从 bidsByDateRange 中更新 url 和 source
-    aiRecommendations.value = response.data.map((rec: any) => {
+    const recommendations = response.data.map((rec: any) => {
       const bid = bidsByDateRange.value.find(b => b.title === rec.title)
       return {
         title: rec.title,
@@ -191,6 +222,13 @@ const fetchAIRecommendations = async () => {
       }
     })
 
+    aiRecommendations.value = recommendations
+
+    // 保存推荐结果到数据库
+    await axios.post('/api/ai/save-recommendations', {
+      recommendations
+    })
+
     ElMessage.success('AI 推荐获取成功')
   } catch (error: any) {
     ElMessage.error('获取 AI 推荐失败')
@@ -247,9 +285,6 @@ const getConfidenceType = (confidence: number) => {
   if (confidence >= 70) return 'warning'
   return 'info'
 }
-
-// 初始化时设置默认日期范围为最近3天
-setLast3Days()
 </script>
 
 <style scoped>