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/ASL-AI智能文献/04-开发计划/05-全文复筛前端开发计划.md

@@ -1298,5 +1298,6 @@ interface FulltextScreeningResult {
 
 
 
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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2025-01-23_全文复筛前端开发完成.md

@@ -412,5 +412,6 @@ GET    /api/v1/asl/fulltext-screening/tasks/:taskId/export
 
 
 
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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2025-01-23_全文复筛前端逻辑调整.md

@@ -355,5 +355,6 @@ Linter错误：0个
 
 
 
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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2025-11-23_Day5_全文复筛API开发.md

@@ -514,5 +514,6 @@ Failed to open file '\\tmp\\extraction_service\\temp_10000_test.pdf'
 
 
 
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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2026-01-18_智能文献检索DeepSearch集成.md

@@ -172,3 +172,4 @@ UNIFUNCS_API_KEY=sk-xxxx
 - [Postgres-Only 异步任务处理指南](../../02-通用能力层/Postgres-Only异步任务处理指南.md)
 - [数据库开发规范](../../04-开发规范/09-数据库开发规范.md)
 
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