## ADDED Requirements

### Requirement: Device Batch Realname Policy Configuration

The device management list SHALL provide a `批量修改实名顺序` action for selected devices. The action SHALL submit the selected device IDs and exactly one realname policy to `POST /api/admin/devices/batch-update-realname-policy`.

#### Scenario: Open batch realname policy dialog for selected devices

- **GIVEN** 用户在设备列表勾选了一台或多台设备
- **WHEN** 用户点击“批量修改实名顺序”
- **THEN** 页面 MUST open a dialog that displays the selected device count
- **AND** 页面 MUST provide mutually exclusive options `无需实名`、`先实名后购买` 和 `先购买后实名`
- **AND** 页面 MUST display `实际H5流程由设备策略决定` 提示

#### Scenario: Submit selected device policy

- **GIVEN** 用户已选择一项实名认证策略
- **WHEN** 用户确认批量修改
- **THEN** 系统 MUST call `POST /api/admin/devices/batch-update-realname-policy`
- **AND** 请求 MUST contain the selected device IDs as `asset_ids`
- **AND** 请求 MUST contain the selected `realname_policy` as `none`、`before_order` 或 `after_order`

#### Scenario: Refresh devices after all-or-nothing success

- **WHEN** 设备批量实名认证策略接口成功返回
- **THEN** 页面 MUST close the dialog
- **AND** 页面 MUST refresh the current device list

#### Scenario: Show failed batch update reason

- **WHEN** 设备批量实名认证策略接口返回业务失败或请求失败
- **THEN** 页面 MUST display the backend business reason when provided
- **AND** 页面 MUST NOT refresh the list as a partial-success result

### Requirement: Device Batch Realname Policy Limit

The device management list MUST limit each realname policy batch submission to 500 selected devices.

#### Scenario: Prevent device batch submission over the limit

- **GIVEN** 用户在设备列表选择超过 500 台设备
- **WHEN** 用户尝试确认批量修改实名认证策略
- **THEN** 页面 MUST prevent the request from being sent
- **AND** 页面 MUST display an explicit maximum-500-items error

### Requirement: Device Batch Policy Is User Selected

The device management list MUST submit the policy explicitly selected by the user and MUST NOT infer, override, or transform it from asset type, card type, or other asset fields.

#### Scenario: Preserve selected device policy value

- **GIVEN** 用户在批量配置弹框选择任一实名认证策略
- **WHEN** 用户确认提交
- **THEN** 请求中的 `realname_policy` MUST equal the selected option
