Add safe overlay support to cua-qemu-windows container #843
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This PR adds overlay support to the cua-qemu-windows container using hard links,
allowing multiple isolated sessions from a single golden image.
Overlay mode is detected safely by verifying that /storage is empty, avoiding
potential data loss. Hard links are used by default with a fallback to regular
copy when unsupported.
Implements Option A as recommended and addresses the overlay detection concerns
raised in #699.
Fixes #699