fix(pkb): fix create KB and upload issues - remove simulated upload, fix department mapping, add upload modal

Fixed issues:
- Remove simulateUpload function from DashboardPage Step 3
- Map department to description field when creating KB
- Add upload modal in WorkspacePage knowledge assets tab
- Fix DocumentUpload import path (../../stores to ../stores)

Known issue: Dify API validation error during document upload (file uploaded but DB record failed, needs investigation)

Testing: KB creation works, upload dialog opens correctly

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

@@ -608,6 +608,9 @@ async saveProcessedData(recordId, newData) {
 
 
 
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docs/02-通用能力层/通用能力层技术债务清单.md

@@ -795,6 +795,9 @@ export const AsyncProgressBar: React.FC<AsyncProgressBarProps> = ({
 
 
 
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