- add LokiConfig and batching lokiSyncer for dev-mode direct log push
- refactor zap logger to support mode-aware encoding and K8s pod fields
- fix RabbitMQ shutdown race: move CloseRabbitProxy to defer so channel
closes before connection (prevents 504 error on Ctrl+C)
- wrap MsgChan with EventMessage to carry per-cycle trace carrier
- create new root OTel span per computation cycle linked to startup span,
giving each cycle an independent traceID with startup as reference
douxu