Implementation of namespaced-volume migration

[noctarius]

This PR implements namespaced-volume (subsystem) migration.

[Copilot]

Pull request overview

This PR adds support for “namespaced” (multi-namespace-per-subsystem) volume migrations by detecting whether a volume’s StorageClass provisions shared NVMe subsystems and forwarding that information to the backend as a batch flag on the ContinueMigration call.

Changes:

• Extend the WebAPI ContinueMigration request to optionally send a batch flag.
• Detect multi-namespace volumes from the PV’s StorageClass (max_namespace_per_subsys > 1) and persist the verdict in VolumeMigration status.
• Update CRDs/manifests and add unit tests covering detection + backend flag propagation.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
operator/internal/webapi/rebalancing.go	Adds batch field to ContinueMigration request payload and threads it through the client call.
operator/internal/controller/volumemigration_controller.go	Resolves and stores multi-namespace verdict from StorageClass, and passes it to ContinueMigration; adds StorageClass RBAC.
operator/internal/controller/volumemigration_controller_unit_test.go	Seeds StorageClasses via client-go fake clientset and adds tests for detection + batch propagation.
operator/internal/autoplacement/logical_volume_selector.go	Removes outdated comment near namespaced-set logic.
operator/dist/install.yaml	Updates generated install CRD schema to include status.multiNamespace.
operator/config/crd/bases/storage.simplyblock.io_volumemigrations.yaml	Updates CRD base schema for status.multiNamespace.
operator/api/v1alpha1/volumemigration_types.go	Adds MultiNamespace field to VolumeMigrationStatus.
helm-charts/charts/simplyblock-operator/crds/storage.simplyblock.io_volumemigrations.yaml	Updates Helm-packaged CRD schema for status.multiNamespace.

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