feat(设备状态): 添加空闲状态并更新UI样式

- 在设备状态映射中添加空闲状态及其颜色配置
- 移除盘点按钮的图标以简化界面
- 更新设备详情模态框的背景渐变颜色

frontend/src/components/device/DeviceDetailModal.jsx

@@ -283,7 +283,7 @@ const DeviceDetailModal = ({
 
       <div
         style={{
-          background: `linear-gradient(135deg, ${colors.primary.main} 0%, ${colors.primary.dark} 50%, ${colors.purple.main} 100%)`,
+          background: `linear-gradient(135deg, #10b981 0%, #34d399 50%, #6ee7b7 100%)`,
           padding: '28px 32px',
           color: '#fff',
           position: 'relative',

frontend/src/pages/InventoryTaskExecution.jsx

@@ -854,11 +854,7 @@ const InventoryTaskExecution = () => {
               </Tooltip>
             </>
           ) : null}
-          <Button
-            type="link"
-            icon={<ScanOutlined />}
-            onClick={() => handleCheck(record)}
-          >
+          <Button type="link" onClick={() => handleCheck(record)}>
             盘点
           </Button>
         </Space>

frontend/src/utils/deviceUtils.jsx

@@ -12,6 +12,7 @@ export const STATUS_MAP = {
   maintenance: { text: '维护中', color: '#faad14', badgeColor: 'orange' },
   offline: { text: '离线', color: '#8c8c8c', badgeColor: 'default' },
   fault: { text: '故障', color: '#ff4d4f', badgeColor: 'red' },
+  idle: { text: '空闲', color: '#36cfc9', badgeColor: 'cyan' },
 };
 
 export const TYPE_MAP = {