Open Shopify to install Comms

This retired typed-domain endpoint returns 409 shopify_owned_install_required with install_url https://apps.shopify.com/comms-by-osis for every workspace, including existing paid and operator-curated customers. Install or reopen Comms from Shopify, approve OAuth, then connect the verified store to a Comms workspace. Old consent links must also restart from Shopify. Existing connections, custom-app credentials, checkout functionality, and billing are unchanged. Requires an owner/admin or a comms_payments_manage key.