feat: 代理支持、外部API增强、调度器修复、每日文章看板

- 添加 HTTP 代理支持（国内直连、外网走代理）
- 外部 API 新增全文搜索、源健康度/错误筛选、未读筛选
- 修复 APScheduler 线程静默崩溃（_safe_fetch 异常保护）
- 健康检查暴露调度器状态
- Dashboard 新增每日文章数柱状图（按 published_at）
- 文章列表 API 补上 content 字段，日期筛选修复时间范围
- 修复外部 API 双重 external 前缀
- User-Agent 改为 Chrome 标识缓解 403
- 添加完整 API 接口文档

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/api/index.js

@@ -43,6 +43,7 @@ export const articlesApi = {
   list: (params = {}) => api.get('/api/articles', { params }),
   get: (id) => api.get(`/api/articles/${id}`),
   search: (q) => api.get('/api/articles/search/fulltext', { params: { q } }),
+  searchFulltext: (params = {}) => api.get('/api/articles/search/fulltext', { params }),
   markRead: (id) => api.put(`/api/articles/${id}/read`),
 }
 
@@ -51,6 +52,7 @@ export const dashboardApi = {
   stats: () => api.get('/api/dashboard/stats'),
   health: (params = {}) => api.get('/api/dashboard/health', { params }),
   recentActivity: () => api.get('/api/dashboard/recent-activity'),
+  articlesDaily: (params = {}) => api.get('/api/dashboard/articles-daily', { params }),
 }
 
 // 对外 API

frontend/src/views/Articles.vue

@@ -118,13 +118,16 @@ const loadArticles = async () => {
     if (filterFeed.value) params.feed_id = filterFeed.value
     if (filterCategory.value) params.category = filterCategory.value
     if (dateRange.value && dateRange.value[0]) {
-      params.since = dateRange.value[0]
-      params.until = dateRange.value[1]
+      params.since = dateRange.value[0] + 'T00:00:00'
+      params.until = dateRange.value[1] + 'T23:59:59'
     }
 
     // 如果有搜索词，使用全文搜索
     if (searchQuery.value && searchQuery.value.trim()) {
-      const res = await articlesApi.search(searchQuery.value.trim())
+      const searchParams = { q: searchQuery.value.trim(), limit: pageSize.value, offset: (page.value - 1) * pageSize.value }
+      if (filterFeed.value) searchParams.feed_id = filterFeed.value
+      if (filterCategory.value) searchParams.category = filterCategory.value
+      const res = await articlesApi.searchFulltext(searchParams)
       articles.value = res.items || []
       stats.value = { total: res.total }
     } else {

frontend/src/views/Dashboard.vue

@@ -82,6 +82,26 @@
       </el-col>
     </el-row>
 
+    <!-- 每日文章统计 -->
+    <el-row style="margin-top: 20px;">
+      <el-col :span="24">
+        <div class="dark-card">
+          <div class="dark-card-header">
+            <span>📈 每日文章数（按发布日期）</span>
+          </div>
+          <div class="daily-chart" v-loading="loadingDaily">
+            <div v-for="d in dailyData" :key="d.date" class="daily-bar-wrap">
+              <div class="daily-bar" :style="{ height: barHeight(d.count) + 'px' }">
+                <span class="daily-count">{{ d.count }}</span>
+              </div>
+              <div class="daily-date">{{ shortDate(d.date) }}</div>
+            </div>
+            <div v-if="!dailyData.length && !loadingDaily" class="empty-row">暂无数据</div>
+          </div>
+        </div>
+      </el-col>
+    </el-row>
+
     <!-- 分类分布 -->
     <el-row style="margin-top: 20px;">
       <el-col :span="24">
@@ -112,6 +132,8 @@ const recentActivity = ref([])
 const loadingHealth = ref(false)
 const loadingActivity = ref(false)
 const categoryStats = ref([])
+const dailyData = ref([])
+const loadingDaily = ref(false)
 
 const statsCards = computed(() => [
   { key: 'feeds', label: 'RSS 源总数', value: stats.value.total_feeds || 0, color: '#63b3ed' },
@@ -185,6 +207,29 @@ const loadActivity = async () => {
   }
 }
 
+const loadDaily = async () => {
+  loadingDaily.value = true
+  try {
+    const res = await dashboardApi.articlesDaily({ days: 14 })
+    dailyData.value = (res.data || []).reverse()
+  } catch (e) {
+    console.error('加载每日统计失败', e)
+  } finally {
+    loadingDaily.value = false
+  }
+}
+
+const barHeight = (count) => {
+  const max = Math.max(...dailyData.value.map(d => d.count), 1)
+  return Math.max(4, Math.round((count / max) * 120))
+}
+
+const shortDate = (date) => {
+  if (!date) return ''
+  const d = new Date(date)
+  return `${d.getMonth() + 1}/${d.getDate()}`
+}
+
 const loadCategories = async () => {
   try {
     const feeds = await feedsApi.list({ limit: 1000 })
@@ -203,6 +248,7 @@ onMounted(() => {
   loadStats()
   loadHealth()
   loadActivity()
+  loadDaily()
   loadCategories()
 })
 </script>
@@ -250,6 +296,50 @@ onMounted(() => {
   overflow: hidden;
 }
 
+/* 每日文章柱状图 */
+.daily-chart {
+  display: flex;
+  align-items: flex-end;
+  gap: 6px;
+  padding: 20px 16px 8px;
+  height: 200px;
+  overflow-x: auto;
+}
+
+.daily-bar-wrap {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  flex: 1;
+  min-width: 32px;
+}
+
+.daily-bar {
+  width: 100%;
+  max-width: 40px;
+  background: linear-gradient(180deg, #63b3ed, #3182ce);
+  border-radius: 3px 3px 0 0;
+  position: relative;
+  min-height: 4px;
+}
+
+.daily-count {
+  position: absolute;
+  top: -18px;
+  left: 50%;
+  transform: translateX(-50%);
+  font-size: 11px;
+  color: var(--text-secondary);
+  white-space: nowrap;
+}
+
+.daily-date {
+  font-size: 10px;
+  color: var(--text-secondary);
+  margin-top: 4px;
+  white-space: nowrap;
+}
+
 .dark-card-header {
   display: flex;
   justify-content: space-between;