chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

backend/app/services/recipes.py

@@ -0,0 +1,44 @@
+from app.models.entities import Product
+
+RECIPES = [
+    {
+        "id": "tomato-pasta",
+        "name": {"de": "Tomaten-Pasta", "en": "Tomato pasta"},
+        "ingredients": ["tomato", "tomate", "pasta", "nudeln", "cheese", "käse"],
+        "steps": {"de": ["Nudeln kochen", "Tomaten anbraten", "Mit Käse servieren"], "en": ["Cook pasta", "Warm tomatoes", "Serve with cheese"]},
+    },
+    {
+        "id": "omelette",
+        "name": {"de": "Gemüse-Omelett", "en": "Vegetable omelette"},
+        "ingredients": ["egg", "ei", "cheese", "käse", "pepper", "paprika", "milk", "milch"],
+        "steps": {"de": ["Eier verquirlen", "Gemüse anbraten", "Stocken lassen"], "en": ["Whisk eggs", "Saute vegetables", "Let it set"]},
+    },
+    {
+        "id": "rice-bowl",
+        "name": {"de": "Reis-Bowl", "en": "Rice bowl"},
+        "ingredients": ["rice", "reis", "beans", "bohnen", "corn", "mais", "yogurt", "joghurt"],
+        "steps": {"de": ["Reis erhitzen", "Toppings ergänzen", "Mit Sauce servieren"], "en": ["Warm rice", "Add toppings", "Serve with sauce"]},
+    },
+]
+
+
+def suggest(products: list[Product], language: str) -> list[dict]:
+    names = " ".join([p.name.lower() for p in products])
+    expiring = {p.id for p in products if p.expires_at}
+    suggestions: list[dict] = []
+    for recipe in RECIPES:
+        matches = [i for i in recipe["ingredients"] if i in names]
+        if not matches:
+            continue
+        score = len(matches) + min(len(expiring), 3)
+        suggestions.append(
+            {
+                "id": recipe["id"],
+                "name": recipe["name"].get(language, recipe["name"]["en"]),
+                "matchedIngredients": sorted(set(matches)),
+                "score": score,
+                "steps": recipe["steps"].get(language, recipe["steps"]["en"]),
+            }
+        )
+    return sorted(suggestions, key=lambda item: item["score"], reverse=True)
+