Add SQL query for average cost retrieval and generate TriggerLog model

prisma/migrations/20251213151216_init/migration.sql

@@ -0,0 +1,8 @@
+/*
+  Warnings:
+
+  - Added the required column `remainedInStock` to the `Stock_Movements` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE `Stock_Movements` ADD COLUMN `remainedInStock` DECIMAL(10, 2) NOT NULL;