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/08-项目管理/03-每周计划/2025-12-13-Postgres-Only架构改造完成.md

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docs/08-项目管理/05-技术债务/通用对话服务抽取计划.md

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docs/08-项目管理/2026-01-11-数据库事故总结.md

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docs/08-项目管理/PKB前端问题修复报告.md

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docs/08-项目管理/PKB前端验证指南.md

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docs/08-项目管理/PKB功能审查报告-阶段0.md

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docs/08-项目管理/PKB和RVW功能迁移计划.md

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docs/08-项目管理/PKB精细化优化报告.md

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docs/08-项目管理/PKB迁移-超级安全执行计划.md

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docs/08-项目管理/PKB迁移-阶段1完成报告.md

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docs/08-项目管理/PKB迁移-阶段2完成报告.md

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docs/08-项目管理/PKB迁移-阶段2进行中.md

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docs/08-项目管理/PKB迁移-阶段3完成报告.md

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docs/08-项目管理/PKB迁移-阶段4完成报告.md

@@ -527,5 +527,6 @@ const response = await fetch('/api/v2/pkb/batch-tasks/batch/execute', {
 
 
 
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