Add cart data model and multi-item foundation (Phase 1)#3
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Introduce items array internally to replace flat pricing fields. New src/cart.js with computeCartTotals() and normalizeItems(). Backward compatible — legacy single-domain attributes auto-convert to a one-item cart via normalizeItems().
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Introduce items array internally to replace flat pricing fields.
New src/cart.js with computeCartTotals() and normalizeItems().
Backward compatible — legacy single-domain attributes auto-convert to a one-item cart via normalizeItems().