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/routes/test_lora_manager_lifecycle.py

@@ -4,6 +4,7 @@ import asyncio
 import logging
 from pathlib import Path
 from types import SimpleNamespace
+from typing import Any
 
 import pytest
 from aiohttp import web
@@ -160,7 +161,7 @@ async def test_lora_manager_lifecycle(monkeypatch: pytest.MonkeyPatch, tmp_path:
     )
 
     original_create_task = asyncio.create_task
-    scheduled_tasks: list[asyncio.Task] = []
+    scheduled_tasks: list[asyncio.Task[Any]] = []
 
     def track_create_task(coro, *, name=None):
         task = original_create_task(coro, name=name)