feat: 退款充值换货列表提交人与审批摘要

openspec/changes/add-business-list-approval-summaries/specs/exchange-management/spec.md

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+## ADDED Requirements
+
+### Requirement: Exchange List Approval Summary Contract
+
+The `GET /api/admin/exchanges` list-item contract SHALL support `submitter_name`, `approval_source`, `approval_status`, `approval_status_name`, `current_approver_summary`, `processing_status`, and `processing_status_name`.
+
+#### Scenario: Receive exchange approval summary fields
+
+- **GIVEN** 后台换货列表接口返回换货记录
+- **WHEN** 前端解析列表响应
+- **THEN** 换货列表项类型 MUST preserve all approval and processing summary fields
+- **AND** 页面 MUST NOT request an individual approval-detail API to populate the row
+
+### Requirement: Exchange List Approval And Processing Display
+
+The exchange management list SHALL display `提交人`, `审批状态`, `当前审批人摘要`, and `业务处理状态` as distinct columns based on backend summary fields.
+
+#### Scenario: Display exchange with no approval source
+
+- **GIVEN** 换货记录的 `approval_source=none`
+- **WHEN** 页面渲染换货列表行
+- **THEN** `审批状态` MUST display `-`
+- **AND** `当前审批人摘要` MUST display `-`
+
+#### Scenario: Display legacy exchange approval read-only
+
+- **GIVEN** 换货记录的 `approval_source=legacy`
+- **WHEN** 页面渲染换货列表行
+- **THEN** `审批状态` MUST display `历史审批`
+- **AND** 页面 MUST NOT add an approval operation button for that historical approval
+
+#### Scenario: Display WeCom exchange approval summary
+
+- **GIVEN** 换货记录的 `approval_source=wecom`
+- **WHEN** 页面渲染换货列表行
+- **THEN** `审批状态` MUST display backend `approval_status_name`
+- **AND** `当前审批人摘要` MUST display backend `current_approver_summary`
+- **AND** `业务处理状态` MUST independently display backend `processing_status_name`
+
+#### Scenario: View long exchange approver summary
+
+- **GIVEN** 换货记录的 `current_approver_summary` exceeds its table cell width
+- **WHEN** 页面渲染当前审批人摘要列
+- **THEN** 摘要 MUST be visually truncated in the cell
+- **AND** 用户 MUST be able to view the complete backend text on hover
+
+#### Scenario: Paginate exchanges without per-row approval requests
+
+- **WHEN** 用户切换换货列表页码或刷新列表
+- **THEN** 页面 MUST use the exchange list API response for approval summaries
+- **AND** 页面 MUST NOT issue approval-detail requests per exchange row