feat: 资产详情前代后代换货标识

openspec/changes/update-asset-exchange-generation-links/specs/asset-information/spec.md

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+## ADDED Requirements
+
+### Requirement: Asset Exchange Generation Trace Display
+
+The asset information page SHALL display exchange generation relationships exclusively from `exchange_trace.previous_asset` and `exchange_trace.next_asset` returned by `GET /api/admin/assets/resolve/{identifier}`. The frontend MUST NOT infer the exchange chain from asset status, generation, or exchange status.
+
+#### Scenario: Display previous asset for a replacement asset
+
+- **GIVEN** 用户正在查看资产信息页
+- **WHEN** 解析响应包含非空的 `exchange_trace.previous_asset`
+- **THEN** 页面 MUST 显示“换货新资产”标签
+- **AND** 页面 MUST 展示前代资产的标识符和换货单号
+
+#### Scenario: Display next asset for a replaced asset
+
+- **GIVEN** 用户正在查看资产信息页
+- **WHEN** 解析响应包含非空的 `exchange_trace.next_asset`
+- **THEN** 页面 MUST 显示“已换出旧资产”标签
+- **AND** 页面 MUST 展示后代资产的标识符和换货单号
+
+#### Scenario: Display both relationships for an intermediate asset
+
+- **GIVEN** 用户正在查看位于换货链中间的资产
+- **WHEN** 解析响应同时包含非空的 `previous_asset` 和 `next_asset`
+- **THEN** 页面 MUST 同时展示“换货新资产”和“已换出旧资产”两个关联区域
+
+#### Scenario: Hide absent exchange relationship
+
+- **GIVEN** 用户正在查看资产信息页
+- **WHEN** `previous_asset` 或 `next_asset` 为 `null`、空值或未返回
+- **THEN** 页面 MUST NOT 展示对应的换货关联区域
+- **AND** 前端 MUST NOT 根据资产状态、世代编号、换货单状态或其他字段推导该区域
+
+### Requirement: Exchange Related Asset Navigation Authorization
+
+The asset information page SHALL allow navigation to a related exchange asset only when that relationship item has `can_view=true`.
+
+#### Scenario: Navigate to authorized related asset
+
+- **GIVEN** 换货关联资产项的 `can_view=true`
+- **WHEN** 用户点击关联资产标识符
+- **THEN** 系统 MUST 跳转到该关联资产的资产详情
+- **AND** 跳转 MUST 使用关联项返回的 `identifier`
+
+#### Scenario: Render unauthorized related asset as text
+
+- **GIVEN** 换货关联资产项的 `can_view=false`
+- **WHEN** 页面渲染换货关联区域
+- **THEN** 页面 MUST 展示关联资产标识符和换货单号
+- **AND** 页面 MUST NOT 将关联资产标识符渲染为可点击跳转操作
+
+### Requirement: Exchange Trace Response Contract
+
+The frontend asset resolve contract SHALL support optional `exchange_trace.previous_asset` and `exchange_trace.next_asset` items, each with `asset_type`, `asset_id`, `identifier`, `exchange_no`, and `can_view`.
+
+#### Scenario: Read exchange trace response fields
+
+- **WHEN** 前端解析 `GET /api/admin/assets/resolve/{identifier}` 响应
+- **THEN** 前端类型 MUST 支持 `exchange_trace.previous_asset` 和 `exchange_trace.next_asset`
+- **AND** 每个非空关联项 MUST 支持读取 `asset_type`、`asset_id`、`identifier`、`exchange_no`、`can_view`