feat: upgrade version to v1.2.0 (#784)

* feat: upgrade version to v1.2.0

- Update version number to 1.2.0 in all package.json files
- Add v1.2.0 placeholder in CHANGELOG.md with custom SQL cleanup feature
- Upgrade dependencies

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Co-Authored-By: Claude <noreply@anthropic.com>

* fix: update @unhead/vue import path for v2.x compatibility

Change import from '@unhead/vue' to '@unhead/vue/client' for createHead

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Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>

CHANGELOG.md

@@ -1,7 +1,11 @@
 <!-- markdownlint-disable-file MD004 MD024 MD034 MD036 -->
 # CHANGE LOG
 
-## v1.1.0(main)
+## v1.2.0(main)
+
+- feat: |Admin| 维护页面增加自定义 SQL 清理功能，支持定时任务执行自定义清理语句
+
+## v1.1.0
 
 - feat: |AI 提取| 增加 AI 邮件识别功能，使用 Cloudflare Workers AI 自动提取邮件中的验证码、认证链接、服务链接等重要信息
   - 支持优先级提取：验证码 > 认证链接 > 服务链接 > 订阅链接 > 其他链接