release: v1.2.8 — 双域名保存确认与 clear-domains 恢复

启用双域名时以确认框提示锁死风险与恢复方式，不再强制校验 Host。
新增 clear-domains 运维 CLI 与相关文档。

docs-site/en/guide/local-dev.md

@@ -29,6 +29,7 @@ Open `http://localhost:3000/setup` to create the admin account. Data directory d
 | `npm test` | Unit tests |
 | `npm run reset-password` | Reset password (optional username) |
 | `npm run slider` | Reset login verification to local slider |
+| `npm run clear-domains` | Clear site/image URL settings from DB (recover from dual-domain lockout) |
 | `npm run migrate` | Preview legacy dir migration (`-- --apply` to run) |
 
 ## Dev-only variables