refactor and add outlet product table

migrations/000068_create_product_outlet_prices_table.down.sql

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+DROP TABLE IF EXISTS product_outlet_prices;

migrations/000068_create_product_outlet_prices_table.up.sql

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+CREATE TABLE product_outlet_prices (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    product_id UUID NOT NULL REFERENCES products(id) ON DELETE CASCADE,
+    outlet_id UUID NOT NULL REFERENCES outlets(id) ON DELETE CASCADE,
+    price DECIMAL(10,2) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX idx_product_outlet_prices_product_outlet ON product_outlet_prices(product_id, outlet_id);
+CREATE INDEX idx_product_outlet_prices_product_id ON product_outlet_prices(product_id);
+CREATE INDEX idx_product_outlet_prices_outlet_id ON product_outlet_prices(outlet_id);