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/05-部署文档/02-SAE部署完全指南(产品经理版).md

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docs/05-部署文档/07-前端Nginx-SAE部署操作手册.md

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docs/05-部署文档/08-PostgreSQL数据库部署操作手册.md

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docs/05-部署文档/10-Node.js后端-Docker镜像构建手册.md

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docs/05-部署文档/11-Node.js后端-SAE部署配置清单.md

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docs/05-部署文档/12-Node.js后端-SAE部署操作手册.md

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docs/05-部署文档/13-Node.js后端-镜像修复记录.md

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docs/05-部署文档/14-Node.js后端-pino-pretty问题修复.md

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docs/05-部署文档/16-前端Nginx-部署成功总结.md

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docs/05-部署文档/17-完整部署实战手册-2025版.md

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docs/05-部署文档/18-部署文档使用指南.md

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docs/05-部署文档/19-日常更新快速操作手册.md

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docs/05-部署文档/文档修正报告-20251214.md

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