Schritt 1: Fundament der Lebensmittel-Lagerverwaltung (Pantry)

Backend (FastAPI + PostgreSQL): Chargen mit MHD, FEFO-Auslagern,
Einheiten-Umrechnung (Stueck/g/ml + Packungen), Open-Food-Facts-Lookup
mit lokalem Fallback, JWT-Auth mit Rollen (Admin/Nutzer), erster Admin
beim Setup, Einkaufsliste, Ablaufwarnung, Lagerorte, pytest fuer FEFO.

Web-UI (React/Vite): Login, Dashboard, Ein-/Auslagern, Produkte,
Lagerorte, Benutzerverwaltung, Einkaufsliste - rollenabhaengig.

Deploy: docker-compose + install.sh (Docker-Autoinstall, Secrets),
README und Roadmap fuer Schritt 2 (iOS) und Schritt 3.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/test_units.py

@@ -0,0 +1,37 @@
+import pytest
+
+from app.models import BaseUnit, Product
+from app.services.units import UnitError, base_to_packages, to_base_quantity
+
+
+def test_base_unit_passthrough(rice):
+    assert to_base_quantity(rice, 200, "g") == 200
+    assert to_base_quantity(rice, 200, "gramm") == 200
+
+
+def test_package_conversion(rice):
+    # 3 Packungen * 500 g = 1500 g
+    assert to_base_quantity(rice, 3, "package") == 1500
+    assert to_base_quantity(rice, 2, "packung") == 1000
+
+
+def test_wrong_unit_rejected(rice):
+    with pytest.raises(UnitError):
+        to_base_quantity(rice, 1, "ml")
+
+
+def test_package_without_size_rejected():
+    product = Product(name="Ei", base_unit=BaseUnit.piece, package_size=None)
+    with pytest.raises(UnitError):
+        to_base_quantity(product, 1, "package")
+
+
+def test_non_positive_quantity_rejected(rice):
+    with pytest.raises(UnitError):
+        to_base_quantity(rice, 0, "g")
+
+
+def test_base_to_packages(rice):
+    assert base_to_packages(rice, 1500) == 3
+    product = Product(name="Ei", base_unit=BaseUnit.piece, package_size=None)
+    assert base_to_packages(product, 10) is None