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

shopdb/plugins/base.py

@@ -104,6 +104,28 @@ class BasePlugin(ABC):
         """
         return []
 
+    def get_settings_defaults(self) -> List[Dict]:
+        """Declare the Setting rows this plugin owns.
+
+        The framework seeds these at install, at enable, and on every
+        `flask plugin upgrade-all`, so a setting added in a later plugin
+        version reaches a site that installed an earlier one. Declaring a key
+        here is also what tells the settings API which category and type the
+        key belongs to, so a save never has to invent one.
+
+        Each entry is a dict:
+          key         - the Setting key
+          value       - default value (string form)
+          valuetype   - 'string' | 'boolean' | 'integer' | 'json'
+          category    - grouping the plugin's settings page filters on
+          description - what the setting does
+          public      - True if an UNAUTHENTICATED caller may read it (kiosk
+                        and print pages render before login); default False.
+                        Never mark a credential or an integration URL public.
+        Return [] (default) if the plugin owns no settings.
+        """
+        return []
+
     def get_setting(self, key: str, default=None):
         """Read a plugin-scoped setting from the core Setting store.