feat(platform): Fix pg-boss queue conflict and add safety standards

Summary:
- Fix pg-boss queue conflict (duplicate key violation on queue_pkey)
- Add global error listener to prevent process crash
- Reduce connection pool from 10 to 4
- Add graceful shutdown handling (SIGTERM/SIGINT)
- Fix researchWorker recursive call bug in catch block
- Make screeningWorker idempotent using upsert

Security Standards (v1.1):
- Prohibit recursive retry in Worker catch blocks
- Prohibit payload bloat (only store fileKey/ID in job.data)
- Require Worker idempotency (upsert + unique constraint)
- Recommend task-specific expireInSeconds settings
- Document graceful shutdown pattern

New Features:
- PKB signed URL endpoint for document preview/download
- pg_bigm installation guide for Docker
- Dockerfile.postgres-with-extensions for pgvector + pg_bigm

Documentation:
- Update Postgres-Only async task processing guide (v1.1)
- Add troubleshooting SQL queries
- Update safety checklist

Tested: Local verification passed

docs/05-部署文档/02-SAE部署完全指南(产品经理版).md

@@ -902,5 +902,6 @@ ACR镜像仓库：
 
 
 
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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

@@ -242,5 +242,6 @@ curl http://localhost:3001/health
 
 
 
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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

@@ -504,5 +504,6 @@ pgm-2zex1m2y3r23hdn5.pg.rds.aliyuncs.com:5432
 
 
 
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docs/05-部署文档/17-完整部署实战手册-2025版.md

@@ -1832,5 +1832,6 @@ curl http://8.140.53.236/
 
 
 
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docs/05-部署文档/18-部署文档使用指南.md

@@ -380,5 +380,6 @@ crpi-cd5ij4pjt65mweeo.cn-beijing.personal.cr.aliyuncs.com/ai-clinical/backend-se
 
 
 
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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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