Map owner to uploader for S-expression recipes

S-expression recipes use 'owner' field while YAML uses 'uploader'.
Normalize to 'uploader' so recipe listing filter works for both formats.

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

app/services/recipe_service.py

@@ -90,6 +90,10 @@ class RecipeService:
         # Add the recipe_id to the data for convenience
         recipe_data["recipe_id"] = recipe_id
 
+        # Normalize owner/uploader field (S-expr uses 'owner', YAML uses 'uploader')
+        if "owner" in recipe_data and "uploader" not in recipe_data:
+            recipe_data["uploader"] = recipe_data["owner"]
+
         # Get IPFS CID if available
         ipfs_cid = self.cache.get_ipfs_cid(recipe_id)
         if ipfs_cid: