docs(pkb): Add development records and update system status

Summary:
- Add PKB module development record for 2026-01-07
- Create PKB module status document (00-模块当前状态与开发指南.md)
- Update system status document to v2.7

Documents added:
- docs/03-业务模块/PKB-个人知识库/06-开发记录/2026-01-07_PKB模块前端V3设计实现.md
- docs/03-业务模块/PKB-个人知识库/00-模块当前状态与开发指南.md

Documents updated:
- docs/00-系统总体设计/00-系统当前状态与开发指南.md

PKB module progress: 75% complete
- Frontend Dashboard: 90%
- Frontend Workspace: 85%
- 3 work modes implemented
- Batch processing API pending debug

docs/02-通用能力层/Postgres-Only异步任务处理指南.md

@@ -604,5 +604,6 @@ async saveProcessedData(recordId, newData) {
 
 
 
+
 
 

docs/02-通用能力层/通用能力层技术债务清单.md

@@ -791,5 +791,6 @@ export const AsyncProgressBar: React.FC<AsyncProgressBarProps> = ({
 
 
 
+