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/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_AI_Few-shot示例库.md

@@ -587,5 +587,6 @@ df['creatinine'] = pd.to_numeric(df['creatinine'], errors='coerce')
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Bug修复总结_2025-12-08.md

@@ -425,5 +425,6 @@ npm run dev
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Day3开发计划.md

@@ -1002,5 +1002,6 @@ export const aiController = new AIController();
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Day4-5前端开发计划.md

@@ -1336,5 +1336,6 @@ npm install react-markdown
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Pivot列顺序优化总结.md

@@ -244,5 +244,6 @@ FMA___基线 | FMA___1个月 | FMA___2个月
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_方案B实施总结_2025-12-09.md

@@ -402,5 +402,6 @@ formula = "FMA总分（0-100） / 100"
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_缺失值处理_开发进度_2025-12-10.md

@@ -236,5 +236,6 @@ async handleFillnaMice(request, reply) {
 
 
 
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docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_缺失值处理功能_更新说明.md

@@ -208,5 +208,6 @@ method: 'mean' | 'median' | 'mode' | 'constant' | 'ffill' | 'bfill'
 
 
 
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