add cursor rules

.cursor/rules/mikroorm.mdc

@@ -0,0 +1,22 @@
+---
+description: MikroORM
+globs:
+  - "src/**/*.entity.ts"
+  - "src/**/*.service.ts"
+alwaysApply: true
+---
+
+Use MikroORM best practices.
+
+- Never write raw SQL unless necessary.
+- Prefer EntityRepository.
+- Use populate instead of manual joins.
+- Use wrap(entity).assign() for updates.
+- Use transactions when updating multiple entities.
+- Use Collection for OneToMany relations.
+- Use references when appropriate.
+- Avoid N+1 queries.
+- Always type repository injections.
+- Use indexes where needed.---
+alwaysApply: true
+---