feat(meal-planner): structured output for add_meal_to_meal_plan (v0.11.3)

Map verified mpcreate response to same field layout as get_meal_plan.
Key difference: a00.r.r is an array (take [0]) unlike mpcreateByRecipeId
which returns a plain object. is_from_recipe_box is always false.

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

src/mcp_familywall/server.py

@@ -2430,8 +2430,37 @@ def add_meal_to_meal_plan(
     except RuntimeError as exc:
         return f"Error: {exc}"
 
-    # Return raw response until the structure is verified in production.
-    return json.dumps(data, ensure_ascii=False, indent=2)
+    # NOTE: mpcreate returns a00.r.r as an *array*, unlike mpcreateByRecipeId
+    # which returns a plain object.  Take the first (and only) element.
+    try:
+        items = data["a00"]["r"]["r"]
+        if not isinstance(items, list) or not items:
+            raise TypeError("a00.r.r is not a non-empty list")
+        dish = items[0]
+        if not isinstance(dish, dict) or "metaId" not in dish:
+            raise TypeError("unexpected dish shape")
+    except (KeyError, TypeError):
+        return json.dumps(
+            {"warning": "Unexpected mpcreate response structure", "raw": data},
+            ensure_ascii=False,
+            indent=2,
+        )
+
+    rights = dish.get("rights") or {}
+    result: dict[str, Any] = {
+        "id": dish.get("metaId"),
+        "date": dish.get("date"),
+        "type": dish.get("type"),
+        "name": dish.get("name"),
+        "recipe_id": dish.get("recipeId") or None,
+        # mpcreate always creates free-text entries (not from the recipe box).
+        "is_from_recipe_box": False,
+        "note": None,
+        "serves": None,
+        "can_update": rights.get("canUpdate") == "true",
+        "can_delete": rights.get("canDelete") == "true",
+    }
+    return json.dumps(result, ensure_ascii=False, indent=2)
 
 
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