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.

1 files changed, 0 insertions, 0 deletions

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