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)
- Add standalone mode detection via LORA_MANAGER_STANDALONE environment variable
- Improve error handling for settings file loading with specific JSON decode errors
- Add startup messages system to communicate configuration warnings and errors to users
- Include settings file path and startup messages in settings API response
- Automatically save settings when bootstrapping from defaults due to missing/invalid settings file
- Add configuration warnings collection for environment variables and other settings issues
The changes improve robustness of settings management and provide better user feedback when configuration issues occur.
Addressed the aiohttp warnings by aligning the test scaffolding with current best practices. Added an AppKey constant and stored the route tracking list through it to satisfy aiohttp’s NotAppKeyWarning expectations. Swapped the websocket lambdas for async no-op handlers so the registered routes now point to coroutine callables, clearing the deprecation warning about bare functions.
