Incorrect Module Placement: `AuthService` Should Not Be Part of Styleguide

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Problem:
AuthService is currently located within the styleguide package/module. This violates separation of concerns and breaks modular boundaries.

📍 File in question:

export 'core/services/auth_service.dart';

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📎 Why It’s a Problem

• styleguide should only contain design system elements:
  ⮞ Colors, themes, typography, spacing, and reusable UI components.

• Authentication logic is application-level domain logic, not visual or styling-related.

• Keeping it inside styleguide creates tight coupling and breaks reuse.

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✅ Recommendation

• Move AuthService to a feature- or domain-specific module (e.g. core, auth, or services).
• Remove any exports from the styleguide that expose business logic.

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Impact:

• Restores proper architectural boundaries
• Makes styleguide reusable and independent
• Reduces coupling between design system and application logic