chore: initial commit Dutra Store POS app

supabase/migrations/20240103_add_payment_method.sql

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+-- Migration: add payment method fields to sales table
+-- Run this in Supabase SQL Editor before using payment features
+
+ALTER TABLE sales
+  ADD COLUMN IF NOT EXISTS payment_method text NOT NULL DEFAULT 'tunai',
+  ADD COLUMN IF NOT EXISTS split_payment jsonb;
+
+-- Optional: add index for filtering by payment method
+CREATE INDEX IF NOT EXISTS idx_sales_payment_method ON sales(payment_method);