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/app/routers/groups.py

@@ -0,0 +1,44 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from ..database import get_db
+from ..deps import get_current_user, require_admin
+from ..models import Group, User
+from ..schemas import GroupCreate, GroupOut
+
+router = APIRouter(prefix="/groups", tags=["groups"])
+
+
+@router.get("", response_model=list[GroupOut])
+def list_groups(
+    db: Session = Depends(get_db), _: User = Depends(get_current_user)
+) -> list[Group]:
+    return db.query(Group).order_by(Group.name).all()
+
+
+@router.post("", response_model=GroupOut, status_code=status.HTTP_201_CREATED)
+def create_group(
+    payload: GroupCreate,
+    db: Session = Depends(get_db),
+    _: User = Depends(require_admin),
+) -> Group:
+    if db.query(Group).filter(Group.name == payload.name).first():
+        raise HTTPException(status.HTTP_409_CONFLICT, "Gruppe existiert bereits")
+    group = Group(name=payload.name, min_stock=payload.min_stock)
+    db.add(group)
+    db.commit()
+    db.refresh(group)
+    return group
+
+
+@router.delete("/{group_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_group(
+    group_id: int,
+    db: Session = Depends(get_db),
+    _: User = Depends(require_admin),
+) -> None:
+    group = db.get(Group, group_id)
+    if group is None:
+        raise HTTPException(status.HTTP_404_NOT_FOUND, "Gruppe nicht gefunden")
+    db.delete(group)
+    db.commit()