sms, line, teams, bluebubbles, msgraph_webhook, whatsapp_cloud, wecom_callback and
feishu (webhook mode) build their aiohttp app exactly as before and hand it to
bind_listener(): standalone and default-profile behaviour is unchanged (same host,
port, reuse_address, access_log), while a multiplex secondary publishes the app for
/p/<profile>/ forwarding instead of binding. BlueBubbles registers the /p/<profile>/
URL with its server; LINE builds media URLs off the shared listener's prefix when no
LINE_PUBLIC_URL is set; WeCom skips its own port-in-use probe in shared mode.
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