Fix list_recipes to use offset parameter

Match the router's expected signature and return type.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/recipe_service.py

@@ -34,7 +34,7 @@ class RecipeService:
 
         return None
 
-    async def list_recipes(self, actor_id: str = None, page: int = 1, limit: int = 20) -> Dict[str, Any]:
+    async def list_recipes(self, actor_id: str = None, offset: int = 0, limit: int = 20) -> list:
         """List available recipes with pagination."""
         recipes = []
         cursor = 0
@@ -59,20 +59,7 @@ class RecipeService:
         recipes.sort(key=lambda r: r.get("name", ""))
 
         # Paginate
-        total = len(recipes)
-        start = (page - 1) * limit
-        end = start + limit
-        page_recipes = recipes[start:end]
-
-        return {
-            "recipes": page_recipes,
-            "pagination": {
-                "page": page,
-                "limit": limit,
-                "total": total,
-                "has_more": end < total,
-            }
-        }
+        return recipes[offset:offset + limit]
 
     async def save_recipe(self, recipe_id: str, recipe_data: Dict[str, Any]) -> None:
         """Save a recipe to Redis."""