fix: 增强数据库启动容错，解决重启后 ECONNREFUSED 和 57P01 crash#6
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三层防御： - db.ts: pg.Pool 增加 idle-error 监听器，避免数据库重启导致 uncaughtException - migrations.ts: runMigrations 前等待数据库就绪，自动重试临时性连接错误 - docker-compose: Postgres healthcheck 增加 start_period 和更多 retries，修复 DATABASE_URL 默认值硬编码问题
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三层防御：