Add endpoints for master and key access management to configure default
and allowed namespaces, including propagation options.
Implement GET and DELETE operations for individual bindings.
Update sync service to persist bindings snapshots even when no upstreams
are available.
Standardize alignment of struct tags in models and field assignments in
services for better readability. Additionally, include the Binding model
in the test database auto-migration.
Implement handlers for creating, listing, and updating model bindings.
Register new routes in the admin server group and add DTO definitions.
Update provider handlers to trigger binding synchronization on changes
to ensure upstream mappings remain current.
