feat: KDocs 上传增强 + 离线监控 + Bug修复

KDocs 上传功能增强:
- 搜索优化：只用姓名搜索 + C列验证，避免匹配到错误单元格
- 有效行范围：支持配置起始行/结束行，限制上传区域
- 图片覆盖：支持覆盖单元格已有图片（Escape + Delete）
- 配置持久化：kdocs_row_start/row_end 保存到数据库（v18迁移）

二次登录功能:
- 登录后立即再次登录，让"上次登录时间"显示为刚刚

KDocs 离线监控:
- 每5分钟检测金山文档登录状态
- 离线时发送邮件通知管理员（每次掉线只通知一次）
- 恢复在线后重置通知状态

Bug 修复:
- 任务日志搜索账号关键词报错500：添加异常处理

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/admin/assets/SettingsPage-D91FOriC.js

@@ -0,0 +1 @@
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