fix(types): resolve pre-existing basedpyright errors in py/ and standalone.py

Fix ~950 basedpyright errors across the backend:
- Convert ineffective # type: ignore comments to # pyright: ignore[rule]
- Add missing generic type arguments (Dict[str, Any], list[Any], ...)
- Annotate dynamic dict literals and runtime-initialized attributes
- Widen CivitAI provider tuple signatures in recipe parsers
- Remove dead LoraRoutes handlers calling nonexistent LoraService methods
- Suppress unavoidable ServiceRegistry import cycles (basedpyright counts
  function-local imports as cycle edges)

py/utils/example_images_migration.py

@@ -371,7 +371,7 @@ class ExampleImagesMigration:
                                 found = True
                                 break
                                 
-                        if not found:
+                        if not found or old_path is None:
                             logger.warning(f"Could not find file for index {index} in {model_hash}, skipping")
                             continue