- /p/<profile>/line/webhook is verified with the NAMED profile's channel secret under
its runtime scope; another profile's secret is 401 at that URL; the bare path is
untouched; unknown profile / profile without the adapter is 404.
- A shared-listener adapter binds no port and records its /p/<profile>/ ingress_url
in runtime status; LINE media URLs use the shared prefix.
- Runner: a secondary's port-binders are constructed in shared-listener mode instead
of refusing the whole profile; api_server/webhook are skipped as mirrors.
- Dashboard: only the mirrored pair is refused (409) on a secondary.
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