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/04-开发规范/09-数据库开发规范.md

@@ -318,3 +318,6 @@ npx tsx check_iit_asl_data.ts
 
 详见：`docs/08-项目管理/2026-01-11-数据库事故总结.md`
 
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docs/04-开发规范/10-模块认证规范.md

@@ -188,3 +188,4 @@ interface DecodedToken {
 - 后端 JWT 服务: `backend/src/common/auth/jwt.service.ts`
 
 
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