feat: add description field to data.media

[dannda]

Description

add description field to data.media to hold text longer that the media caption

fixes #93

Type of change

• 🐛 Bug fix (non-breaking change that resolves an issue)
• ✨ New feature (non-breaking change that adds functionality)
• ⚡ Optimisation (non-breaking improvement to performance or efficiency)
• 🧩 Documentation (adds or improves documentation)
• 🧱 Maintenance (refactor, dependency update, CI/CD, etc.)
• 🔥 Breaking change (fix or feature that causes existing functionality to change)

Checklist

• All tests pass (eg. npm test)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)
• Documentation updated (if required)

[Copilot]

Pull request overview

Adds a new long-form text field to the data.media Strapi component so media entries can store additional text beyond the underlying uploaded asset’s caption limit (per #93).

Changes:

• Add description attribute (type text) to src/components/data/media.json.

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[Copilot]

Issue #93 and the component’s semantics describe this as a (long) "caption" for the media, but the new attribute is named "description". Since this becomes part of the public API, consider renaming the field to "caption" (or another clearly caption-specific name), or update the issue/consumer expectations to avoid ambiguity with other "description" fields in the schema.

Suggested change

	"description": {
	"caption": {