在比价记录中展示是否下单 (#88)

## 改动说明
- 在“省”列后新增“是否下单”列
- 使用“已下单/未下单”标签展示
- 同步补充前端接口类型

## 验证
- Next.js 生产构建和类型检查通过

---------

Co-authored-by: linkeyu <798648091@qq.com>
Reviewed-on: #88
Co-authored-by: linkeyu <linkeyu@wonderable.ai>
Co-committed-by: linkeyu <linkeyu@wonderable.ai>

src/app/(main)/comparison-records/page.tsx

@@ -333,6 +333,14 @@ export default function ComparisonRecordsPage() {
           <b style={{ color: r.saved_amount_cents > 0 ? '#3f8600' : '#999' }}>{yuan(r.saved_amount_cents)}</b>
         ),
     },
+    {
+      title: '是否下单',
+      dataIndex: 'ordered',
+      width: 84,
+      render: (ordered: boolean) => (
+        <Tag color={ordered ? 'green' : 'default'}>{ordered ? '已下单' : '未下单'}</Tag>
+      ),
+    },
     { title: 'LLM', dataIndex: 'llm_call_count', width: 56, render: (v) => v ?? '-' },
     {
       title: 'TOKEN',

src/lib/types.ts

@@ -457,6 +457,7 @@ export interface ComparisonRecordListItem {
   source_price_cents: number | null;
   best_price_cents: number | null;
   saved_amount_cents: number | null;
+  ordered: boolean;
   total_ms: number | null;
   step_count: number | null;
   llm_call_count: number | null;