i18n(ko-KR): add v6.mdx translation

[nurooong]

Description (required)

• i18n(ko-KR): add v6.mdx translation
• Translation of src/content/docs/en/guides/upgrade-to/v6.mdx

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
ko/guides/upgrade-to/v6.mdx	Localization added, will be marked as complete.
ko/reference/adapter-reference.mdx	Localization changed, will be marked as complete. 🔄️
ko/reference/errors/content-collection-invalid-type.mdx	Localization changed, will be marked as complete.
ko/reference/errors/legacy-content-config-error.mdx	Localization changed, will be marked as complete.
ko/reference/modules/astro-transitions.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[jsparkdev]

Hello @nurooong,
Thank you for the translation.

Could you please also apply the newly added PRs #13547, #13571, and #13618, and fix the broken links?

[nurooong]

Hello @jsparkdev, I have updated the PR with the following:

• Rebased onto the latest main.
• Synced with all latest changes (PRs fix: replace model with module in upgrade-to/v6.mdx #13547, New Ecosystem tab #13571, Fixes some nits and blog post link in upgrade-to/v6.mdx #13618).
• Fixed all 16 broken fragment links (verified with linkcheck).

Sorry for the delay, and thank you for your patience!

[jsparkdev]

LGTM!
Thanks for your contribution, @nurooong !