continuing refactor

cmdlet/_shared.py

@@ -203,7 +203,6 @@ class SharedArgs:
         type="string",
         description="Selects a plugin instance",
         query_key="instance",
-        query_aliases=["store"],
     )
 
     URL = CmdletArg(
@@ -234,7 +233,7 @@ class SharedArgs:
                 Only includes backends that successfully initialized at startup.
 
         Example:
-                SharedArgs.STORE.choices = SharedArgs.get_store_choices(config)
+                SharedArgs.INSTANCE.choices = SharedArgs.get_store_choices(config)
         """
         # Use the cached startup check result if available (unless force=True)
         if not force and hasattr(SharedArgs, "_cached_available_stores"):
@@ -273,14 +272,19 @@ class SharedArgs:
             if skip_instantiation:
                 return
 
+            names: set[str] = set()
+
+            # Plugin-based multi-instance backends (config["plugin"] / config["provider"] sections)
             try:
-                from Store.registry import Store as StoreRegistry
-                registry = StoreRegistry(config=config, suppress_debug=True)
-                available = registry.list_backends()
-                if available:
-                    SharedArgs._cached_available_stores = available
+                from ProviderCore.registry import REGISTRY
+                plugin_instances = REGISTRY.list_storage_plugin_instances(config)
+                for _plugin_name, instance_names in plugin_instances.items():
+                    names.update(instance_names)
             except Exception:
                 pass
+
+            if names:
+                SharedArgs._cached_available_stores = sorted(names)
         except Exception:
             SharedArgs._cached_available_stores = []
 
@@ -4187,6 +4191,11 @@ def check_url_exists_in_storage(
             is_hydrus_backend = bool(hydrus_provider and hydrus_provider.is_backend(backend, str(backend_name)))
         except Exception:
             is_hydrus_backend = False
+        if not is_hydrus_backend:
+            try:
+                is_hydrus_backend = str(getattr(backend, "STORE_TYPE", "")).strip().lower() == "hydrusnetwork"
+            except Exception:
+                is_hydrus_backend = False
 
         if is_hydrus_backend:
             if not hydrus_available: