Release v0.3.8

refactor: implement unified service dependency management (#74)

* refactor: implement unified service dependency management

  - Add ServiceType enum with sync.Once for safe channel closing
  - Implement ServiceProber interface for gvproxy, ignition, podman, ssh
  - Replace manual waiting with WaitForServices() API
  - Consolidate probe logic from pkg/service into pkg/vmconfig
  - Add YAML-based gvproxy configuration
  - Update dependencies (gvisor-tap-vsock v0.8.8)

  This provides clearer service dependencies and eliminates duplicate
  probe code across the codebase.

* fix ci lint

docs: update README (#67)

fix(ssh): gvpconn was closed multiple times

refactor: separation of responsibilities to create vmprovider (#62)

fix(restapi): standardize flag constants and add conditional REST API…

… server startup (#53)

feat(restapi): support /guestexec & /hostexec sse api (#47)

refactor(bootstrap): increase the number of dhclient attempts (#38)

fix(builder): missing fsck.ext4 (#37)

refactor(vm): given vm more system resource (#14)