新增订单收票付款交货跟进并完善使用升级手册

增加部分付款和部分交货状态、工作台筛选、权限校验、跟进记录及 v4 数据迁移；补充 Windows EXE 构建与验收脚本。附 16 页 PDF 使用升级手册及企业微信详细配置说明、生成脚本和测试截图。验证：76 项回归测试、EXE 浏览器验收与 PDF 逐页校验通过。

po_app/templates/index.html

@@ -8,6 +8,31 @@
   <div class="stat"><div class="v">{{ '%.2f'|format(month_total) }}</div><div class="k">审批通过订单总额（元）</div></div>
 </div>
 
+<div class="card tracking-dashboard">
+  <div class="card-head"><h2>付款与交货概况</h2><a href="{{ url_for('orders', status='approved') }}">查看全部</a></div>
+  <p class="muted">统计当前可见、审批通过的订单。各类数量可能重叠；部分付款和部分交货按订单状态统计。</p>
+  <div class="stat-row">
+    {% for key in ['prepayment','invoice_due','unpaid','paid','undelivered','partial_delivery','paid_undelivered','completed'] %}
+    <a class="stat tracking-stat" data-tracking="{{ key }}" href="{{ url_for('orders', tracking=key) }}"><div class="v">{{ tracking_counts[key] }}</div><div class="k">{{ TRACKING_FILTERS[key] }}</div></a>
+    {% endfor %}
+  </div>
+  <div class="toolbar tracking-shortcuts">{% for key in ['partial_payment','delivered','unrecorded','recheck'] %}<a class="btn sm" data-tracking="{{ key }}" href="{{ url_for('orders', tracking=key) }}">{{ TRACKING_FILTERS[key] }}（{{ tracking_counts[key] }}）</a>{% endfor %}</div>
+  <h3>最近审批通过的订单</h3>
+  <table class="grid tracking-table">
+    <tr><th>订单 / 供应商</th><th class="num">订单金额</th><th>预付款</th><th>收票</th><th>付款</th><th>交货</th><th>操作</th></tr>
+    {% for o in tracking_rows %}
+    <tr>
+      <td><a href="{{ url_for('order_view', oid=o.id) }}#order-tracking">{{ o.order_no }}</a><div class="muted">{{ o.supplier_name }}</div>{% if o.fulfillment_stale or o.payment_stale %}<div class="tracking-warning">变更后待核对</div>{% endif %}</td>
+      <td class="num">{{ '%.2f'|format(o.total_amount) }}</td><td>{{ '需要' if o.needs_prepayment else '—' }}</td>
+      <td><span class="badge track-{{ o.invoice_status }}">{{ o.invoice_status_text }}</span></td>
+      <td><span class="badge track-{{ o.payment_status }}">{{ o.payment_status_text }}</span></td>
+      <td><span class="badge track-{{ o.delivery_status }}">{{ o.delivery_status_text }}</span></td>
+      <td><a class="btn sm" href="{{ url_for('order_view', oid=o.id) }}#order-tracking">查看跟进</a></td>
+    </tr>
+    {% else %}<tr><td colspan="7" class="center muted">暂无审批通过的订单</td></tr>{% endfor %}
+  </table>
+</div>
+
 {% if todo %}
 <div class="card">
   <h2>待我处理（{{ todo|length }}）</h2>