fix(rest): send explicit auto_stop with remove-on-stop

[G4614]

Split out of #1056. Deprecated auto_remove translates to auto_delete=1 client-side, but the REST wire format left auto_stop unset in that case, letting the server apply its own default auto-stop interval on top of an immediate-delete request. Send auto_stop=0 explicitly whenever auto_delete is a positive remove-on-stop value and the caller has not set auto_stop themselves.

Unrelated to volume mounts or the fuse sandbox change — a single-line lifecycle-timing fix bundled into the same commit as both, split out for independent review.

Test plan:

• BOXLITE_DEPS_STUB=1 cargo test -p boxlite --lib --features rest rest::types — 17/17 pass, including new remove_on_stop_sends_zero_autostop

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