feat(childManage): add service interfaces for content, settings and time restrictions

📌 Description

This PR introduces the core implementation of the Child Restriction Management module within the brainboost-child-management-service microservice. It provides the backend logic and RESTful endpoints to manage child usage preferences and restrictions, including:

• ⏱️ Restriction Time Configuration

  • Define allowed usage days: PUT /time/{id}/days
  • Set allowed daily time range: PUT /time/{id}/range
  • Set maximum allowed usage time per day: PUT /time/{id}/max-time

• 🚫 Content Restrictions

  • Enable/disable restrictions for specific sections like japprends, accueilassistant, challenge, and *search: PUT /content/{id}/restriction`

• 📝 Forbidden Words Management

  • Add forbidden words: PUT /settings/{id}/forbidden-word
  • Remove forbidden words: DELETE /settings/{id}/forbidden-word

• 💾 Save or Update Settings

  • Save all settings including time and content restrictions: POST /settings

All features follow clean architecture (Controller → Service → Repository), utilize DTOs, and interact with a PostgreSQL database.

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✅ Features Completed

• REST Controllers and routes for restriction management
• DTOs and mappers for structured data transfer
• Business logic in the service layer
• JPA repositories for DB operations
• PostgreSQL integration
• Error handling and validation

Closes IA-704