add cursor rules

.cursor/rules/architecture.mdc

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+---
+description: Architecture
+alwaysApply: true
+---
+
+Before generating code:
+
+- Search for existing implementations.
+- Reuse existing services.
+- Reuse existing DTOs.
+- Follow naming conventions.
+- Match the project's coding style.
+- Never duplicate logic.
+- Prefer extending existing modules.

.cursor/rules/mikroorm.mdc

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+---
+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
+---

.cursor/rules/nestjs.mdc

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+---
+description: NestJS Backend Rules
+globs:
+  - "src/**/*.ts"
+alwaysApply: true
+---
+
+You are an expert NestJS developer.
+
+Rules:
+
+- Use dependency injection.
+- Use constructor injection instead of manually creating services.
+- Follow the existing folder structure.
+- Keep controllers thin.
+- Business logic belongs in services.
+- DTOs must use class-validator.
+- Always create DTOs for request bodies.
+- Return typed responses.
+- Use async/await.
+- Never use any.
+- Prefer readonly where possible.
+- Use ConfigService instead of process.env directly.
+- Throw NestJS HttpExceptions.
+- Write clean, maintainable TypeScript.

.cursor/rules/performance.mdc

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+---
+description: Performance
+alwaysApply: true
+---
+
+Optimize for performance.
+
+- Minimize database queries.
+- Batch database operations.
+- Avoid N+1.
+- Paginate large datasets.
+- Select only required columns.---
+alwaysApply: true
+---

.cursor/rules/postgres.mdc

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+---
+description: PostgreSQL
+alwaysApply: true
+---
+
+Database rules:
+
+- Prefer UUID primary keys.
+- Index foreign keys.
+- Avoid SELECT *.
+- Design queries to use indexes.
+- Use migrations instead of synchronize.
+- Never remove data unless explicitly requested.---
+alwaysApply: true
+---

.cursor/rules/typescript.mdc

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+---
+description: TypeScript
+alwaysApply: true
+---
+
+Code quality:
+
+- Never use any.
+- Prefer unknown over any.
+- Use interfaces for DTOs.
+- Use enums only when appropriate.
+- Use strict typing.
+- Add return types to exported functions.
+- Keep functions under 40 lines when possible.