Show the kiosk label prefix, and let a plugin declare the settings it owns

shopdb/__init__.py

@@ -36,7 +36,13 @@ from .plugins import plugin_manager
 # unattended endpoints (e.g. the GE-Enforce fetch API) can authorize a scoped
 # managed service token without importing core token internals. Additive name
 # on the import surface, minor bump.
-__contract_version__ = '0.15.0'
+# 0.16.0: added the get_settings_defaults hook so a plugin declares the Setting
+# rows it owns (key, value, type, category, description, public). The framework
+# seeds them at install, at enable, and on `flask plugin upgrade-all`, files a
+# first-time write under the declared category, and lets a plugin mark a key
+# readable without auth for pages that run logged out. Additive optional hook,
+# minor bump.
+__contract_version__ = '0.16.0'
 
 # Product release version (see ADR-007). The product version and the
 # plugin-contract version above are distinct series with independent