feat(user): advanced user features (profile, preferences, activity, a…

[akargi]

Advanced User Service Features (Issue #79)

Summary

This update introduces advanced user management features, significantly enhancing the user service and API. The following capabilities are now supported:

• User Profile Management: Custom fields (bio, location, avatar).
• Preferences & Settings: Flexible JSON-based user preferences.
• User Activity Tracking: Log and retrieve user actions/history.
• Avatar & Media Management: Upload and update user avatars.
• User Search & Discovery: Search users by name, email, or location.
• Relationship Management: Follow/unfollow users, list followers/following.
• Analytics & Engagement: Metrics for logins, activity, followers, and following.
• Privacy & Data Export: Manage privacy settings and request data export.

Implementation Details

• Extended Prisma schema and user entity for new fields and relations.
• Updated DTOs and types for advanced features.
• Enhanced user service with new methods for all advanced features.
• Exposed new endpoints in the user controller for API access.

How to Test

• Use the new endpoints under /users for profile, preferences, activity, avatar, search, relationships, analytics, and privacy.
• Verify user creation, updates, and advanced feature functionality via API or Swagger UI.

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Closes #79.