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When multiple EROFS layers are present, wrap them into a single GPT-partitioned virtual disk delivered via one VMDK descriptor and a single block device hotplug which significantly reduce pci bus slots compared with the previous one-device-per-layer approach that exhausts virtio-blk slots for large layer counts. The host detects multi-layer mounts, computes the GPT layout, generates head metadata plus a VMDK descriptor referencing all EROFS images, and hot-plugs the composite disk. Per-partition Storage entries are created with X-kata.gpt-partitioned and X-kata.partition-number options so the guest agent can resolve each layer to its partition device. Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>