Fix Tandoor pagination: use page/page_size instead of limit/offset

Tandoor's /api/recipe/ endpoint uses Django REST Framework's
PageNumberPagination (page + page_size), not LimitOffsetPagination.
The limit/offset params were silently ignored, returning all recipes
on every page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/tandoor.py

@@ -87,8 +87,8 @@ class TandoorClient:
         Returns {"items": [...], "page": int, "per_page": int, "total": int}.
         """
         params: dict = {
-            "limit": per_page,
-            "offset": (page - 1) * per_page,
+            "page": page,
+            "page_size": per_page,
             "format": "json",
         }
         if search: