Add create-meta-recipe endpoint with nested slots/options/bases

- POST /api/create-meta-recipe/ creates full meta-recipe in one call
- PUT /api/create-meta-recipe/ updates existing (requires id)
- Auto-resolves ingredients by name/alias, creates new if not found
- Returns full nested response with _created_ingredients list
- New writable serializers: MetaRecipeWriteSerializer, SlotWriteSerializer, etc.

kitchen/serializers.py

@@ -75,6 +75,47 @@ class MetaRecipeSerializer(serializers.ModelSerializer):
         fields = "__all__"
 
 
+# --- Writable nested meta-recipe ---
+
+
+class SlotOptionWriteSerializer(serializers.Serializer):
+    ingredient_name = serializers.CharField()
+    ingredient_id = serializers.IntegerField(required=False)
+    quantity_per_serving = serializers.DecimalField(max_digits=8, decimal_places=2)
+    unit = serializers.CharField()
+    notes = serializers.CharField(required=False, default="", allow_blank=True)
+    # For auto-creating ingredients
+    default_unit = serializers.CharField(required=False)
+    tags = serializers.ListField(child=serializers.CharField(), required=False, default=list)
+    shelf_life_days = serializers.IntegerField(required=False, allow_null=True, default=None)
+
+
+class SlotWriteSerializer(serializers.Serializer):
+    name = serializers.CharField()
+    required = serializers.BooleanField(default=True)
+    max_choices = serializers.IntegerField(default=1)
+    options = SlotOptionWriteSerializer(many=True)
+
+
+class BaseIngredientWriteSerializer(serializers.Serializer):
+    ingredient_name = serializers.CharField()
+    ingredient_id = serializers.IntegerField(required=False)
+    quantity_per_serving = serializers.DecimalField(max_digits=8, decimal_places=2)
+    unit = serializers.CharField()
+
+
+class MetaRecipeWriteSerializer(serializers.Serializer):
+    name = serializers.CharField()
+    method = serializers.CharField()
+    prep_time_mins = serializers.IntegerField(required=False, allow_null=True, default=None)
+    cook_time_mins = serializers.IntegerField(required=False, allow_null=True, default=None)
+    default_servings = serializers.IntegerField(default=2)
+    gear_needed = serializers.CharField(required=False, default="", allow_blank=True)
+    tags = serializers.ListField(child=serializers.CharField(), required=False, default=list)
+    slots = SlotWriteSerializer(many=True, required=False, default=list)
+    base_ingredients = BaseIngredientWriteSerializer(many=True, required=False, default=list)
+
+
 # --- Fixed Recipe nested serializers ---