feat(media): integrate Spatie Media Library + avatar upload (webp) with AvatarUpload component

[Barata-Ribeiro]

This PR introduces full integration with spatie/laravel-medialibrary to manage user media, specifically user avatars. It removes the old imageable implementation, prepares the database, updates the User model, adds a dedicated frontend upload component, and integrates avatar handling into the profile update flow. Avatars are now generated in webp format for improved performance.

Commits included (9):

• chore: install spatie/laravel-medialibrary
• remove(imageable): delete obsolete imageable model
• feat(media): prepare database and publish config
• feat(user): implement media handling with Media Library
• feat(avatar): add AvatarUpload component
• feat(media): update User model with avatar property and adjustments
• feat(profile): add avatar upload functionality to profile update
• feat(profile): integrate AvatarUpload into profile update flow
• feat(user): switch avatar handling to webp and improve UX
• refactor(file-upload): simplify file validation and improve handling of multiple file uploads

Files changed: 28
Commits: 10

Motivation

• Replace outdated custom image handling with a modern and well-maintained media package.
• Standardize avatar storage and support image transformations (webp).
• Introduce a reusable frontend component for avatar uploads.
• Improve performance and reduce image payload sizes.

What’s included

• Composer installation of Spatie Media Library.
• Publishing of migrations and configuration files.
• Removal of the legacy imageable model.
• User model updated to use HasMedia and InteractsWithMedia.
• New media collection avatars with webp conversion.
• New frontend component AvatarUpload for image selection & preview.
• Updated profile controller/logic to persist avatar media.
• Validation rules and error handling improvements throughout the flow.