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/main.py

@@ -0,0 +1,61 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from .config import get_settings
+from .database import Base, SessionLocal, engine
+from .routers import (
+    auth,
+    groups,
+    locations,
+    products,
+    settings as settings_router,
+    stock,
+    users,
+    views,
+)
+from .seed import ensure_first_admin
+
+settings = get_settings()
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Tabellen anlegen (MVP: create_all statt Alembic-Migrationen).
+    Base.metadata.create_all(bind=engine)
+    db = SessionLocal()
+    try:
+        ensure_first_admin(db)
+    finally:
+        db.close()
+    yield
+
+
+app = FastAPI(title="Pantry – Lebensmittel-Lagerverwaltung", version="1.0.0", lifespan=lifespan)
+
+origins = ["*"] if settings.cors_origins.strip() == "*" else [
+    o.strip() for o in settings.cors_origins.split(",") if o.strip()
+]
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=origins,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.get("/health", tags=["meta"])
+def health() -> dict:
+    return {"status": "ok"}
+
+
+app.include_router(auth.router)
+app.include_router(users.router)
+app.include_router(products.router)
+app.include_router(stock.router)
+app.include_router(locations.router)
+app.include_router(groups.router)
+app.include_router(views.router)
+app.include_router(settings_router.router)