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.
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