Fix/strapi media url

[laszlo-san]

• Add URL detection using new URL() constructor
• Return absolute URLs as-is without prepending base URL
• Maintain backward compatibility for relative paths
• Add documentation with examples

Fixes URL malformation in production environments where Strapi Cloud returns full URLs (e.g., https://domain.media.strapiapp.com/image.jpg) instead of relative paths, preventing double-prefixing with base URL.

Types of changes

• [x] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

On self hosted/local dev environments Strapi returns relative paths for media resources, Strapi Cloud hovewer returns an absolute path, thus the url useStrapiMedia would return will be something like https://{strapiURL}/https://{domain}.media.strapiapp.com/path

Checklist:

• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes (if not applicable, please state why)

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