add customer name, service info, second pickup location, and structured address fields to deliveries

backend/internal/db/migrations/000003_add_delivery_fields.up.sql

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+-- Add new fields for delivery improvements
+
+-- Client information
+ALTER TABLE deliveries ADD COLUMN customer_name text NOT NULL DEFAULT '';
+
+-- Services (assembly, lifting, etc.)
+ALTER TABLE deliveries ADD COLUMN service_info text;
+
+-- Second pickup location
+ALTER TABLE deliveries ADD COLUMN pickup_location_2 varchar(20);
+ALTER TABLE deliveries ADD COLUMN product_name_2 text;
+
+-- Structured address components
+ALTER TABLE deliveries ADD COLUMN street text NOT NULL DEFAULT '';
+ALTER TABLE deliveries ADD COLUMN house text NOT NULL DEFAULT '';
+ALTER TABLE deliveries ADD COLUMN apartment text;
+ALTER TABLE deliveries ADD COLUMN entrance text;
+ALTER TABLE deliveries ADD COLUMN floor text;