The panel now talks to Incus over its Unix socket REST API
(/var/lib/incus/unix.socket, group incus-admin) exclusively:
- internal/lx: exec moved from the `lxc` CLI to the API websocket
transport (Exec/ExecSH/RunInitScript); EnsureImage pulls a
remote-qualified fallback (images:debian/13) before Launch since the
API cannot auto-fetch it inside the create call; per-container df
probe in mgr/batch.go uses the same API path.
- cfg: config key renamed lxd.* -> incus.* (image, image_fallback,
pool, bridge, socket); DefaultSocket is the Debian-package path.
- mgr: container disk probe and image handling updated; comment sweep
from LXD to Incus.
- deps: add gorilla/websocket for the exec transport.
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