feat: sn

openspec/changes/update-device-batch-import-contract/proposal.md

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+# Change: 更新设备导入模板新增 SN 列
+
+## Why
+
+设备批量导入模板有一处明确变更：在必填 `virtual_no` 后新增一个非必填 `sn` 列。
+
+如果后台继续分发旧模板，运营按旧列顺序填表时会与最新模板不一致，影响设备导入使用。
+
+本提案只覆盖这一个变化，不引入其他接口、流程、默认值或交互行为调整。
+
+## What Changes
+
+- 更新设备任务页使用的 `设备导入模板.xlsx`，在 `virtual_no` 后新增可选 `sn` 列
+- 更新设备任务页“批量导入设备”弹窗说明文案，明确 `sn` 为新增的可选列
+
+## Impact
+
+- Affected specs:
+  - `device-batch-import`
+- Affected code:
+  - `src/template/设备导入模板.xlsx`
+  - `src/views/asset-management/task-management/device-task/index.vue`
+- Breaking changes:
+  - 无接口层 breaking change

openspec/changes/update-device-batch-import-contract/specs/device-batch-import/spec.md

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+# Device Batch Import Specification
+
+## ADDED Requirements
+
+### Requirement: Admin device import template includes optional sn after virtual_no
+
+The admin device import template SHALL insert an optional `sn` column immediately after required `virtual_no`.
+
+#### Scenario: Download the latest device import template
+
+- **GIVEN** a platform user opens the "批量导入设备" dialog
+- **WHEN** the user clicks "下载导入模板"
+- **THEN** the downloaded template MUST include `virtual_no` as the first column
+- **AND** the downloaded template MUST include `sn` as the second column
+- **AND** `sn` MUST be optional
+
+#### Scenario: Import dialog documents the new sn column
+
+- **GIVEN** a platform user opens the "批量导入设备" dialog
+- **WHEN** the import instructions are displayed
+- **THEN** the page MUST indicate that `sn` is an optional column in the device import template

openspec/changes/update-device-batch-import-contract/tasks.md

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+## 1. Implementation
+
+- [x] 1.1 更新 `src/template/设备导入模板.xlsx`，在 `virtual_no` 后新增 `sn` 列
+- [x] 1.2 更新设备任务页导入弹窗文案，明确 `sn` 是新增的非必填列
+- [x] 1.3 验证模板首行列顺序包含新增 `sn` 列