[mirror] use coordination.apoxy.dev for mirror lease heartbeat

Move the mirror lease from the built-in coordination.k8s.io API
(which stays local to the edge cluster) to coordination.apoxy.dev
so it routes through the apiservice proxy to the cloud apiserver.
This allows the cloud-side GC controller to detect expired leases
and clean up orphaned mirrored objects.

- Change api/coordination/v1 group from coordination.k8s.io to
  coordination.apoxy.dev
- Add +genclient marker and include in codegen/update.sh
- Register coordination.apoxy.dev/v1 as an aggregated APIService
- Add Lease to defaultResources() and scheme init()
- Switch mirror controller from k8s coordination client to the
  generated versioned client (apoxyClient.CoordinationV1())
- Regenerate client, lister, and informer code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dilyevsky

api/coordination/v1/doc.go

@@ -1,5 +1,6 @@
-// +k8s:deepcopy-gen=package
+// +k8s:deepcopy-gen=package,register
 // +k8s:openapi-gen=true
+// +groupName=coordination.apoxy.dev
 
-// Package v1 contains the coordination.k8s.io/v1 Lease API type for the Apoxy apiserver.
+// Package v1 contains the coordination.apoxy.dev/v1 Lease API type for the Apoxy apiserver.
 package v1

api/coordination/v1/register.go

@@ -8,13 +8,15 @@ import (
 	"sigs.k8s.io/apiserver-runtime/pkg/builder/resource"
 )
 
+// +genclient
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 // +k8s:openapi-gen=true
 // +kubebuilder:object:root=true
 
-// Lease is a wrapper around the standard coordination.k8s.io/v1 Lease that
-// implements the apiserver-runtime resource.Object interface. It reuses the
-// upstream LeaseSpec so clients can use the standard coordination API.
+// Lease is a wrapper around the standard coordination/v1 LeaseSpec that
+// implements the apiserver-runtime resource.Object interface. Served under
+// the coordination.apoxy.dev group so edge clusters can route it through
+// the apiservice proxy to the cloud apiserver.
 type Lease struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`