feat: 重构AI推荐功能并优化爬虫基础URL

重构前端AI推荐组件，移除本地过滤逻辑，改为从后端获取日期范围内的数据
新增AI服务模块，包含Prompt和推荐逻辑
为投标服务添加按日期范围查询接口
统一各爬虫服务的baseURL格式

frontend/src/components/Dashboard-AI.vue

@@ -106,7 +106,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, watch } from 'vue'
+import { ref } from 'vue'
 import axios from 'axios'
 import { ElMessage } from 'element-plus'
 import { MagicStick, Loading, InfoFilled, List } from '@element-plus/icons-vue'
@@ -132,36 +132,6 @@ const showAllBids = ref(false)
 const bidsLoading = ref(false)
 const bidsByDateRange = ref<any[]>([])
 
-// 根据日期范围过滤 bids
-const filteredBids = computed(() => {
-  let result = props.bids
-
-  // 按日期范围筛选（只限制开始时间，不限制结束时间）
-  if (dateRange.value && dateRange.value.length === 2) {
-    const [startDate] = dateRange.value
-    result = result.filter(bid => {
-      if (!bid.publishDate) return false
-      const bidDate = new Date(bid.publishDate)
-      const start = new Date(startDate)
-      // 设置时间为当天的开始
-      start.setHours(0, 0, 0, 0)
-      return bidDate >= start
-    })
-  }
-
-  return result
-})
-
-// 监听日期范围变化并显示提示
-watch(dateRange, () => {
-  const totalBids = props.bids.length
-  const filteredCount = filteredBids.value.length
-
-  if (totalBids > 0 && filteredCount < totalBids) {
-    ElMessage.info(`筛选结果：共 ${filteredCount} 条数据（总共 ${totalBids} 条）`)
-  }
-})
-
 // 设置日期范围为最近3天
 const setLast3Days = () => {
   const endDate = new Date()
@@ -200,12 +170,9 @@ const setLast7Days = () => {
 const fetchAIRecommendations = async () => {
   loading.value = true
   try {
-    // 准备发送给后端的数据（使用过滤后的 bids）
-    const bidsData = filteredBids.value.map(bid => ({
-      title: bid.title,
-      url: bid.url,
-      source: bid.source,
-      publishDate: bid.publishDate
+    // 准备发送给后端的数据（只包含 title）
+    const bidsData = bidsByDateRange.value.map(bid => ({
+      title: bid.title
     }))
 
     // 调用后端 API
@@ -213,7 +180,16 @@ const fetchAIRecommendations = async () => {
       bids: bidsData
     })
 
-    aiRecommendations.value = response.data
+    // 根据 title 从 bidsByDateRange 中更新 url 和 source
+    aiRecommendations.value = response.data.map((rec: any) => {
+      const bid = bidsByDateRange.value.find(b => b.title === rec.title)
+      return {
+        title: rec.title,
+        url: bid?.url || '',
+        source: bid?.source || '',
+        confidence: rec.confidence
+      }
+    })
 
     ElMessage.success('AI 推荐获取成功')
   } catch (error: any) {