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wire spec-driven replicas and Redis password for VirtualMCPServer (#4367)

* 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

* wire spec-driven replicas and Redis password for VirtualMCPServer

- Nil-passthrough for Deployment.Spec.Replicas (hands-off when spec.replicas
  is nil, spec-driven when set) for HPA compatibility
- Add terminationGracePeriodSeconds (30s) to vMCP pod spec
- Add buildRedisPasswordEnvVar: injects THV_SESSION_REDIS_PASSWORD from
  SessionStorageConfig.PasswordRef when provider is redis
- Sync Spec.Replicas on update when spec.replicas is non-nil
- deploymentNeedsUpdate detects replica drift for spec-driven scaling

Closes: #4215

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

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