FEAT[BE] :add marketing type and conversion fields to marketing entities and services

internal/database/migrations/20260203054206_update_marketing_tables.up.sql

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+-- Add marketing_type to marketings table
+ALTER TABLE marketings
+ADD COLUMN IF NOT EXISTS marketing_type VARCHAR(50);
+
+-- Add convertion fields to marketing_products table
+ALTER TABLE marketing_products
+ADD COLUMN IF NOT EXISTS convertion_unit VARCHAR(20),
+ADD COLUMN IF NOT EXISTS weight_per_convertion NUMERIC(15, 3),
+ADD COLUMN IF NOT EXISTS week INTEGER;