Consolidate the inline HostingAccountMember lookups (Overview/Search/Hosting
Product/Afia controllers) into HostingAccessResolver, which can source hosting
developer-access from the monolith's central /identity/hosting/developer-access
(correlating cPanel usernames to local account ids). Shadow mode by default
(HOSTING_CENTRAL_DEV_ACCESS=false): local hosting_account_members stays
authoritative and divergence from central is logged; flip the flag to cut over.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
