feat: autoayuno-api (FastAPI) — alimentos (OFF) y recetas

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

off.py

@@ -0,0 +1,46 @@
+"""Cliente de Open Food Facts: busca productos y los normaliza a la forma de
+alimento de la app. Tolerante a fallos: devuelve [] si algo va mal."""
+import httpx
+
+_SEARCH = "https://world.openfoodfacts.org/cgi/search.pl"
+
+
+def search(q: str, limit: int = 12) -> list[dict]:
+    """Devuelve alimentos normalizados: {name, kcal_100g, off_id, barcode}."""
+    try:
+        resp = httpx.get(
+            _SEARCH,
+            params={
+                "search_terms": q,
+                "search_simple": 1,
+                "action": "process",
+                "json": 1,
+                "page_size": limit,
+                "fields": "product_name,nutriments,code",
+            },
+            timeout=6.0,
+            headers={"User-Agent": "autoayuno/1.0 (self-hosted)"},
+        )
+        if resp.status_code != 200:
+            return []
+        out = []
+        for p in resp.json().get("products", []):
+            name = (p.get("product_name") or "").strip()
+            kcal = p.get("nutriments", {}).get("energy-kcal_100g")
+            if not name or kcal is None:
+                continue
+            try:
+                kcal = float(kcal)
+            except (TypeError, ValueError):
+                continue
+            if kcal <= 0:
+                continue
+            out.append({
+                "name": name[:120],
+                "kcal_100g": kcal,
+                "off_id": p.get("code"),
+                "barcode": p.get("code"),
+            })
+        return out
+    except Exception:
+        return []