fix(types): resolve pre-existing basedpyright errors in tests

Fix ~790 basedpyright errors across the test suite:
- Type stub subclasses of real production classes with super().__init__()
- Add missing generic type arguments and Dict[str, Any] annotations
- Add None guards before subscript/member access
- Adapt tests to production API changes (removed dead handlers,
  PersistentModelCache.get_default, _i18n_filter_added location)

tests/services/test_recipe_repair.py

@@ -1,5 +1,6 @@
 import pytest
 import asyncio
+from typing import Any, Dict
 from unittest.mock import AsyncMock, MagicMock
 from py.services.recipe_scanner import RecipeScanner
 from types import SimpleNamespace
@@ -259,7 +260,7 @@ async def test_repair_all_recipes_strips_runtime_fields(setup_scanner):
     recipe_scanner, mock_civitai_client, mock_metadata_provider = setup_scanner
     
     # Recipe with runtime fields
-    recipe = {
+    recipe: Dict[str, Any] = {
         "id": "r1",
         "title": "Cleanup Test",
         "checkpoint": {