feat(payment): 支付管理 - 新增支付订单与对账 CSV 导出

docs/content/docs/backend/code-map.mdx

@@ -24,6 +24,7 @@ description: 从产品功能快速定位主要代码入口
 | 画布编辑器 | `web/src/pages/canvas/project.tsx` | `pages/canvas/canvas-project-*`、`pages/canvas/use-canvas-*`、`components/canvas/`、`lib/canvas/`、`stores/canvas/` |
 | 公开分享 | `web/src/pages/canvas/shared.tsx` | `components/canvas/infinite-canvas.tsx`、`services/api/canvas-share.ts` |
 | 管理后台 | `web/src/pages/admin/`、`router.tsx` | `admin-context.tsx`、`users/`、`channels/`、`logs/`、`storyboard-prompts/`、`settings/`、`components/agent-lessons-panel.tsx` |
+| 支付 CSV 导出 | `web/src/pages/admin/payments/payments-page.tsx` | `services/api/payments.ts`、`AdminExportButton`；后端 `handler/payment_export.go`、`app/payment_export.go`、`repository/payment_export.go`（共享筛选、只读快照） |
 
 ## 画布核心