docs: refine station v5 migration spec

Junjie

11 小时以前 7867a3dd7706657de7b1a4cf9e1436683947ae75

docs: refine station v5 migration spec

 docs/superpowers/specs/2026-03-24-station-v5-replace-v4-design.md

@@ -86,8 +86,8 @@

新增一条幂等 SQL 脚本，把旧 Devp 配置统一迁移到 `ZyStationV5Thread`：

- 条件：`device_type = Devp` 且 `thread_impl = ZyStationV4Thread`
- 动作：更新 `thread_impl = ZyStationV5Thread`
- 条件：`device_type = 'Devp'` 且 `thread_impl = 'ZyStationV4Thread'`
- 动作：更新 `thread_impl = 'ZyStationV5Thread'`

该脚本不依赖事前统计，允许空跑。