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/03-业务模块/IIT Manager Agent/06-开发记录/2026-01-04-Dify知识库集成开发记录.md

@@ -642,3 +642,6 @@ REDCap API: exportRecords success { recordCount: 1 }
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day2-REDCap实时集成开发完成记录.md

@@ -648,3 +648,6 @@ backend/src/modules/iit-manager/
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day3-企业微信集成与端到端测试完成记录.md

@@ -798,3 +798,6 @@ CREATE TABLE iit_schema.wechat_tokens (
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day3-企业微信集成开发完成记录.md

@@ -555,3 +555,6 @@ Day 3 的开发工作虽然遇到了多个技术问题，但最终成功完成
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Phase1.5-AI对话集成REDCap完成记录.md

@@ -322,3 +322,6 @@ AI: "出生日期：2017-01-04
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/V1.1更新完成报告.md

@@ -266,3 +266,6 @@ Day 4: REDCap EM（Webhook推送）← 作为增强，而非核心
 
 
 
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