Refactor code structure for improved readability and maintainability

MIGRATIONS.md

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+# TypeORM Migrations Guide
+
+This project uses TypeORM migrations for database schema management in production environments.
+
+## Migration Commands
+
+### Generate Migration
+
+Generate a migration file based on entity changes:
+
+```bash
+# Start the database first
+yarn docker:dev:detached
+
+# Generate migration from entity changes
+yarn migration:generate src/migrations/YourMigrationName
+```
+
+### Create Empty Migration
+
+Create an empty migration file for custom SQL:
+
+```bash
+yarn migration:create src/migrations/YourMigrationName
+```
+
+### Run Migrations
+
+Apply pending migrations to the database:
+
+```bash
+yarn migration:run
+```
+
+### Revert Migration
+
+Revert the last applied migration:
+
+```bash
+yarn migration:revert
+```
+
+### Show Migration Status
+
+Show which migrations have been applied:
+
+```bash
+yarn migration:show
+```