Add resumable US policy news collectors and provenance

Collect official crypto and US policy documents with deterministic screening, full bodies and attachments, bounded retries, and durable history cursors. Preserve publication precision and source identity while keeping new collectors disabled.

Add real Congress, GovInfo, DOJ and Federal Register fixtures, offline capture replay, isolated database validation, and rollout instructions. Validate 982 backend tests, frontend checks, and 57 deployment control tests.

web/src/pages/news/components/NewsDetail.vue

@@ -89,7 +89,7 @@ const diffStats = computed(() => ({
       </div>
       <div class="grid grid-cols-2 gap-x-6 gap-y-2 border border-slate-200 rounded-lg border-solid bg-slate-50 px-3 py-2 text-sm">
         <div>
-          <span class="label">发布时间</span><span class="num">{{ formatTime(detail.published_at, "YYYY-MM-DD HH:mm:ss") }}</span>
+          <span class="label">发布时间</span><span class="num">{{ detail.published_at_precision === "date" ? `${detail.published_date}（仅日期）` : formatTime(detail.published_at, "YYYY-MM-DD HH:mm:ss") }}</span>
         </div>
         <div>
           <span class="label">作者</span>{{ detail.author || "-" }}
@@ -112,6 +112,13 @@ const diffStats = computed(() => ({
         title="此条新闻仅采集公开摘要，完整内容请查看原文链接。"
         type="info" :closable="false" show-icon
       />
+      <el-alert v-if="detail.extra.content_scope === 'partial'" title="正文或关键附件存在采集缺口，请核对官方原文。" type="warning" :closable="false" />
+      <div v-if="Array.isArray(detail.extra.attachments)" class="flex flex-wrap gap-2 text-xs">
+        <span v-for="attachment in (detail.extra.attachments as { url: string, title: string, status: string }[])" :key="attachment.url">
+          <el-link :href="attachment.url" target="_blank" type="primary">{{ attachment.title || '附件' }}</el-link>
+          （{{ attachment.status === 'complete' ? '已采集' : '存在缺口' }}）
+        </span>
+      </div>
       <el-tabs v-model="activeTab" class="min-h-0 flex flex-1 flex-col">
         <el-tab-pane :label="summaryOnly ? '摘要' : '正文'" name="content" class="h-full">
           <iframe :srcdoc="srcdoc" sandbox="allow-popups allow-popups-to-escape-sandbox" class="h-full w-full border-0" />