fix(backend): 统一 VM 回调到生命周期

[yokowu]

Summary

• add a VM lifecycle hook that maps VMStateRunning and VMStateFailed into task lifecycle transitions
• update the internal host callback handler to drive VM state through vmLifecycle for both vm-ready and failed conditions
• add a lifecycle test covering VMStateFailed -> TaskStatusError

Test Plan

• go test ./pkg/lifecycle ./biz/host/handler/v1