feat: TOML config loader for vehicles, journeys, and tax scales

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_config_loader.py

@@ -0,0 +1,30 @@
+def test_get_vehicles_returns_configured_vehicles(app):
+    with app.app_context():
+        from app.config_loader import get_vehicles
+        vehicles = get_vehicles()
+        assert "voiture" in vehicles
+        assert vehicles["voiture"]["co2_per_km"] == 142
+
+
+def test_get_journeys_returns_profiles(app):
+    with app.app_context():
+        from app.config_loader import get_journeys
+        journeys = get_journeys()
+        assert "voiture_seule" in journeys
+        assert journeys["voiture_seule"]["distances"]["voiture"] == 25
+
+
+def test_get_bareme_returns_tranches(app):
+    with app.app_context():
+        from app.config_loader import get_bareme
+        tranches = get_bareme(2025, 5)
+        assert len(tranches) == 3
+        assert tranches[0]["taux"] == 0.548
+
+
+def test_day_types_without_journey(app):
+    with app.app_context():
+        from app.config_loader import day_types_without_journey
+        types = day_types_without_journey()
+        assert "TT" in types
+        assert "WORK" not in types