feat: 预计最终到期时间展示

openspec/changes/add-asset-estimated-final-expiry-display/specs/asset-information/spec.md

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+## ADDED Requirements
+
+### Requirement: Asset Estimated Final Expiry Contract
+
+The admin asset information integration SHALL preserve `estimated_final_expires_at`, `days_until_final_expiry`, `expiry_estimate_status`, and `is_expiring` returned by `GET /api/admin/assets/resolve/{identifier}`.
+
+#### Scenario: Preserve an exact final expiry estimate
+
+- **GIVEN** 用户查询后台资产详情
+- **WHEN** `GET /api/admin/assets/resolve/{identifier}` returns `expiry_estimate_status=exact`
+- **THEN** 前端状态 MUST preserve `estimated_final_expires_at` as `string | null`
+- **AND** 前端状态 MUST preserve `days_until_final_expiry` as `number | null`
+- **AND** 前端状态 MUST preserve `is_expiring` as a boolean
+
+#### Scenario: Preserve an unavailable final expiry estimate
+
+- **GIVEN** 用户查询后台资产详情
+- **WHEN** 接口返回待激活或其他不可预计的 `expiry_estimate_status`
+- **THEN** 前端状态 MUST preserve `expiry_estimate_status`
+- **AND** 前端 MUST NOT derive `estimated_final_expires_at` from current-package or package-detail fields
+
+### Requirement: Asset Estimated Final Expiry Display
+
+The admin asset information view SHALL display one asset-level field labeled `预计套餐到期时间` for the current primary package and all queued primary packages, without replacing individual package expiry dates in package details.
+
+#### Scenario: Display an exact final expiry date
+
+- **GIVEN** 资产详情返回 `expiry_estimate_status=exact`
+- **AND** `estimated_final_expires_at` has a value
+- **WHEN** 页面渲染卡资产或设备资产基础信息
+- **THEN** 页面 MUST display `预计套餐到期时间`
+- **AND** 页面 MUST format and display `estimated_final_expires_at`
+
+#### Scenario: Display activation-pending final expiry
+
+- **GIVEN** 资产详情返回等待激活等不可预计的 `expiry_estimate_status`
+- **WHEN** 页面渲染卡资产或设备资产基础信息
+- **THEN** `预计套餐到期时间` MUST display `待激活后起算`
+- **AND** 页面 MUST NOT display a fabricated date
+
+#### Scenario: Display no-package placeholder
+
+- **GIVEN** 资产没有当前或排队主套餐
+- **AND** `estimated_final_expires_at` is null or absent
+- **WHEN** 页面渲染资产基础信息
+- **THEN** `预计套餐到期时间` MUST display a stable placeholder
+- **AND** 页面 MUST NOT substitute the current package detail expiry date
+
+#### Scenario: Highlight backend-designated expiring asset
+
+- **GIVEN** 资产详情返回 `is_expiring=true`
+- **WHEN** 页面渲染 `预计套餐到期时间`
+- **THEN** 页面 MUST apply the expiring visual treatment using `days_until_final_expiry`
+- **AND** 页面 MUST NOT derive whether the asset is expiring from a locally calculated date difference
+
+#### Scenario: Preserve package detail expiry semantics
+
+- **GIVEN** 用户查看资产详情中的套餐明细
+- **WHEN** 页面渲染单个套餐的到期时间
+- **THEN** 页面 MUST continue to display that package's own expiry field in the package detail context
+- **AND** 页面 MUST NOT replace it with `estimated_final_expires_at`