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Add CRD type changes for horizontal scaling (#4363)

* Add CRD type changes for horizontal scaling

Add SessionStorageConfig struct and scaling fields to MCPServer and
VirtualMCPServer CRDs as the foundation for horizontal scaling support.

- Add SessionStorageConfig struct with Provider, Address, DB, KeyPrefix,
  and PasswordRef fields; CEL rule enforces address is required for redis
- Add Replicas *int32, BackendReplicas *int32, SessionStorage to MCPServerSpec
- Add Replicas *int32, SessionStorage to VirtualMCPServerSpec
- Nil pointer fields allow HPA to manage replicas without operator interference
- Regenerate zz_generated.deepcopy.go and CRD manifests

Closes: #4206

* rebase merge conflicts and fixes from review

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Co-authored-by: taskbot <taskbot@users.noreply.github.com>

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