perf(auth): orgScope 展开冷启动慢 —— 空 scope 短路 + 树缓存单飞/TTL

tenant-group 重构后每请求都派生 org 树(全扫 patient_transactions 数十万行)解析用户 scope,
冷缓存时登录长时间卡(首次慢、之后正常)。修:
- 空 orgScope(全集团用户,最常见)直接短路返回不限,不派生树(400ms→50ms)
- 非空 scope 仍需树:getTree 加单飞(并发 miss 共享一次,防惊群)+ TTL 10min→6h(org 数据日更)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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