Implement automatic reminder engine with admin and company UI.

Add schema v6, read-only scan rules for unsubmitted flows, gaps and pending reviews, deduplicated delivery with append-only event history, daily scan thread, and full API/frontend integration with 18 new tests.

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

web/admin.html

@@ -713,6 +713,22 @@
                 <h1>提醒管理</h1>
                 <p class="page-sub">向成员公司发送处理提醒，并跟踪系统提醒与人工提醒的触达与处理状态。</p>
               </div>
+              <div class="page-actions">
+                <button type="button" class="btn btn-sm" id="reminder-scan-btn">立即扫描</button>
+              </div>
+            </div>
+
+            <div class="card" id="pending-reminders-card" style="margin-bottom: 16px;">
+              <div class="card-head">
+                <span class="card-title">待提醒清单<span class="sub">系统按流水提交、断档、待确认自动发现，点发送即送达对应公司</span></span>
+                <div class="row" style="gap: 10px; align-items: center;">
+                  <span class="meta" id="pending-summary">—</span>
+                  <button type="button" class="btn btn-primary btn-sm" id="pending-send-all" disabled>全部一键发送</button>
+                </div>
+              </div>
+              <div id="pending-list">
+                <div class="empty" id="pending-empty">暂无需要提醒的事项 · 各公司流水与确认进度正常</div>
+              </div>
             </div>
 
             <div class="grid grid-1-2">
@@ -764,6 +780,7 @@
                     <thead>
                       <tr>
                         <th>公司</th>
+                        <th>来源</th>
                         <th>类型</th>
                         <th class="wrap">内容摘要</th>
                         <th>发送时间</th>
@@ -1035,6 +1052,26 @@
       </div>
     </div>
 
+    <!-- 提醒详情抽屉 -->
+    <aside class="drawer" id="reminder-detail-drawer" aria-label="提醒详情">
+      <div class="drawer-head">
+        <div>
+          <span class="pill pill-info" id="rd-source-pill">系统</span>
+          <h2 class="d-title" id="rd-title">提醒详情</h2>
+          <p class="d-desc" id="rd-sub"></p>
+        </div>
+        <button type="button" class="icon-button" data-close-rd aria-label="关闭详情" title="关闭详情">×</button>
+      </div>
+      <div class="drawer-body">
+        <dl class="kv" id="rd-fields"></dl>
+        <h3 style="font-size: 13px; margin: 16px 0 8px; color: var(--muted);">事件留痕</h3>
+        <div id="rd-events"></div>
+      </div>
+      <div class="drawer-foot">
+        <button type="button" class="btn" data-close-rd>关闭</button>
+      </div>
+    </aside>
+
     <!-- 提醒历史弹窗 -->
     <div class="modal-backdrop" id="history-modal">
       <div class="modal">