clan-app: Fix mypy lints and add GenericFnRuntime

pkgs/clan-app/clan_app/components/serializer.py

@@ -1,4 +1,3 @@
-
 import dataclasses
 import logging
 from dataclasses import fields, is_dataclass
@@ -90,4 +89,4 @@ def from_dict(t: type, data: dict[str, Any] | None) -> Any:
 
     except (TypeError, ValueError) as e:
         print(f"Failed to instantiate {t.__name__}: {e}")
-        return None
+        return None