fix(tests): isolate SQLite test databases

Co-authored-by: OpenAI/GPT-5.6-Terra <vibecoder@antoineve.me>

tests/test_config_loader.py

@@ -1,6 +1,7 @@
 import pytest
 
 from app import create_app
+from tests.in_memory_db import IN_MEMORY_DATABASE_URI, in_memory_engine_options
 
 _MINIMAL_CONFIG = """
 [vehicles.citadine]
@@ -26,7 +27,11 @@ default_motor_vehicle_id = "{vehicle_id}"
 def _create_app_with_home_assistant_config(tmp_path, **values):
     config_path = tmp_path / "config.toml"
     config_path.write_text(_MINIMAL_CONFIG.format(**values), encoding="utf-8")
-    return create_app(config_path=str(config_path))
+    return create_app(
+        config_path=str(config_path),
+        database_uri=IN_MEMORY_DATABASE_URI,
+        engine_options=in_memory_engine_options(),
+    )
 
 
 def test_get_vehicles_returns_configured_vehicles(app):
@@ -164,4 +169,8 @@ timezone = "Europe/Paris"
     )
 
     with pytest.raises(ValueError, match="clé.*manquante"):
-        create_app(config_path=str(config_path))
+        create_app(
+            config_path=str(config_path),
+            database_uri=IN_MEMORY_DATABASE_URI,
+            engine_options=in_memory_engine_options(),
+        )