feat(pkb): Integrate pgvector and create Dify replacement plan

Summary:
- Migrate PostgreSQL to pgvector/pgvector:pg15 Docker image
- Successfully install and verify pgvector 0.8.1 extension
- Create comprehensive Dify-to-pgvector migration plan
- Update PKB module documentation with pgvector status
- Update system documentation with pgvector integration

Key changes:
- docker-compose.yml: Switch to pgvector/pgvector:pg15 image
- Add EkbDocument and EkbChunk data model design
- Design R-C-R-G hybrid retrieval architecture
- Add clinical data JSONB fields (pico, studyDesign, regimen, safety, criteria, endpoints)
- Create detailed 10-day implementation roadmap

Documentation updates:
- PKB module status: pgvector RAG infrastructure ready
- System status: pgvector 0.8.1 integrated
- New: Dify replacement development plan (01-Dify替换为pgvector开发计划.md)
- New: Enterprise medical knowledge base solution V2

Tested: PostgreSQL with pgvector verified, frontend and backend functionality confirmed

docs/03-业务模块/IIT Manager Agent/02-技术设计/IIT Manager Agent 技术路径与架构设计.md

@@ -694,4 +694,5 @@ private async processMessageAsync(xmlData: any) {
 
 
 
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docs/03-业务模块/IIT Manager Agent/04-开发计划/REDCap对接技术方案与实施指南.md

@@ -1087,5 +1087,6 @@ async function testIntegration() {
 
 
 
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docs/03-业务模块/IIT Manager Agent/04-开发计划/企业微信注册指南.md

@@ -228,5 +228,6 @@ Content-Type: application/json
 
 
 
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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

@@ -649,4 +649,5 @@ 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

@@ -654,5 +654,6 @@ 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

@@ -804,5 +804,6 @@ 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

@@ -561,5 +561,6 @@ 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

@@ -328,5 +328,6 @@ 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

@@ -272,5 +272,6 @@ Day 4: REDCap EM（Webhook推送）← 作为增强，而非核心
 
 
 
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docs/03-业务模块/IIT Manager Agent/07-技术债务/IIT Manager Agent 技术债务清单.md

@@ -687,4 +687,5 @@ const answer = `根据研究方案[1]和CRF表格[2]，纳入标准包括：
 
 
 
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