[FXC-6076] Plumb rotor_disk_names into Custom Volume and Farfield Zone Translation

[shreyas-flex]

PR: Plumb rotor_disk_names into Custom Volume and Farfield Zone Translation

FXC: https://flow360.atlassian.net/browse/FXC-6076

Summary

_get_custom_volumes and _build_farfield_zone were calling _translate_enclosed_entity_name without rotor_disk_names, causing any Cylinder entity in a CustomVolume.bounding_entities to always translate to "slidingInterface-<name>" -- even when it's actually a rotor disk (defined via AxisymmetricRefinement). This made the companion C++ fix in VolumeMultiZoneUtils.h unreachable, since the patch name mismatch ("slidingInterface-foo" vs "rotorDisk-foo") prevented the custom zone exclusion logic from working.

Changes

flow360/component/simulation/translator/volume_meshing_translator.py

• _build_farfield_zone(volume_zones) -> _build_farfield_zone(volume_zones, rotor_disk_names=None): forwards to _translate_enclosed_entity_name so that rotor-disk cylinders in farfield enclosed_entities get the "rotorDisk-" prefix.
• _get_custom_volumes(volume_zones) -> _get_custom_volumes(volume_zones, rotor_disk_names=None): forwards to _translate_enclosed_entity_name so that rotor-disk cylinders in CustomVolume.bounding_entities get the "rotorDisk-" prefix.
• Both call sites in get_volume_meshing_json now pass the already-computed rotor_disk_names list.

tests/simulation/translator/test_volume_meshing_translator.py

Added test_custom_volume_with_rotor_disk_cylinder which verifies that when a Cylinder is used as an AxisymmetricRefinement and also placed inside a CustomVolume, both the custom zone and farfield zone patch lists contain "rotorDisk-bet_disk" (not "slidingInterface-bet_disk").

Test Plan

• test_custom_volume_with_rotor_disk_cylinder passes
• Existing test_farfield_enclosed_entities_unwraps_custom_volume_with_cylinder still passes (this test uses RotationVolume, not AxisymmetricRefinement, so the cylinder correctly remains "slidingInterface-")
• All other test_volume_meshing_translator tests pass unchanged

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Note

Low Risk
Low risk: narrowly forwards existing rotor_disk_names into zone patch-name translation and adds a focused regression test; main impact is patch naming in translated meshing JSON for cylinders used as rotor disks.

Overview
Fixes volume-meshing translation so cylinders that are rotor disks (from AxisymmetricRefinement) are named with the rotorDisk- prefix not only in sliding-interface enclosedObjects, but also when referenced inside CustomVolume.bounding_entities and farfield enclosed_entities.

This threads rotor_disk_names through _get_custom_volumes and _build_farfield_zone to _translate_enclosed_entity_name, and adds a regression test asserting both the custom zone and generated farfield zone emit rotorDisk-<name> patches (and not slidingInterface-<name>).

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