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

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

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+-- Remove columns from marketing_products
+ALTER TABLE marketing_products
+DROP COLUMN IF EXISTS week,
+DROP COLUMN IF EXISTS weight_per_convertion,
+DROP COLUMN IF EXISTS convertion_unit;
+
+-- Remove column from marketings
+ALTER TABLE marketings DROP COLUMN IF EXISTS marketing_type;