fix(tests): resolve CI test failures from asyncio event loop and settings reload side-effects

Two root causes identified and fixed:

1. tests/test_api_settings.py (TestListCredentials):
   asyncio.get_event_loop().run_until_complete() raised RuntimeError in
   Python 3.12 because test_api_auth_enabled.py's asyncio.run() sets the
   current event loop to None on completion. Replace all 7 occurrences
   with asyncio.run() which creates its own event loop each time.

2. tests/test_cors.py:
   reload(app.config) replaced the app.config.settings singleton with a
   new instance, so app modules holding the original reference no longer
   saw patches applied to app.config.settings.X. This caused the
   notification, OpenAI, and file-upload tests to behave as if unpatched.
   Remove the redundant reload() calls — the tests only need a fresh
   Settings(...) instance constructed with the env var already set.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_cors.py

@@ -169,12 +169,9 @@ def test_cors_parse_comma_separated_origins():
     original = os.environ.get("CORS_ALLOWED_ORIGINS")
     os.environ["CORS_ALLOWED_ORIGINS"] = "https://app.example.com,https://admin.example.com"
     try:
-        from importlib import reload
+        from app.config import Settings
 
-        import app.config as config_module
-
-        reload(config_module)
-        test_settings = config_module.Settings(
+        test_settings = Settings(
             database_url="sqlite:///:memory:",
             redis_url="redis://localhost:6379/0",
             openai_api_key="test-key",
@@ -204,12 +201,9 @@ def test_cors_single_origin_string_to_list():
     original = os.environ.get("CORS_ALLOWED_ORIGINS")
     os.environ["CORS_ALLOWED_ORIGINS"] = "https://app.example.com"
     try:
-        from importlib import reload
+        from app.config import Settings
 
-        import app.config as config_module
-
-        reload(config_module)
-        test_settings = config_module.Settings(
+        test_settings = Settings(
             database_url="sqlite:///:memory:",
             redis_url="redis://localhost:6379/0",
             openai_api_key="test-key",