Enforces Object Calisthenics principles for business domain code to ensure clean, maintainable, and robust code

# Object Calisthenics Rules

> ⚠️ **Warning:** This file contains the 9 original Object Calisthenics rules. No additional rules must be added, and none of these rules should be replaced or removed.
> Examples may be added later if needed.

## Objective
This rule enforces the principles of Object Calisthenics to ensure clean, maintainable, and robust code in the backend, **primarily for business domain code**.

## Scope and Application
- **Primary focus**: Business domain classes (aggregates, entities, value objects, domain services)
- **Secondary focus**: Application layer services and use case handlers
- **Exemptions**: 
  - DTOs (Data Transfer Objects)
  - API models/contracts
  - Configuration classes
  - Simple data containers without business logic
  - Infrastructure code where flexibility is needed

## Key Principles


1. **One Level of Indentation per Method**:
   - Ensure methods are simple and do not exceed one level of indentation.

   ```csharp