Intermediary-mount re-architecture: drives are visible in-guest at the stable
/mnt/felhom-drives/<name>. Composes already use ${HDD_PATH}/${USERDATA_PATH}
(injected + repointed by controller v0.67.0); this updates the UI placeholders,
templates.json defaults, and doc/script examples to the new convention.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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