docs: add Korean translation of README (README.ko.md)

[comeddy]

Fixes N/A

Summary

Changes

Adds README.ko.md, a complete Korean translation of the root README.md, as a separate file. README.md itself is left untouched.

• Translates all 74 headings, all 101 server-table descriptions, and the prose sections (transport mechanisms, SSE removal notice, local vs remote servers, use cases, installation and setup, running in containers, and the per-client guides for Kiro, Cline, Cursor, Windsurf, VS Code and Claude Code)
• Regenerates the table of contents with GitHub-compatible anchors for the Korean headings. This also picks up two entries that are missing from the English TOC today: Migration & Modernization and Open Data
• Adds a short note at the top pointing back to README.md as the source of truth

Deliberately kept in English:

• The 16 external article/video titles under "Additional Resources", so the link text still matches the English page it points to
• Protocol and product names such as streamable HTTP
• The paste-ready Custom Instructions snippet in the Cline section, since translating it would change what the agent actually receives

User experience

Before: the README is only available in English.

After: Korean readers can open README.ko.md for the same content. README.md is byte-for-byte unchanged, so there is no impact on existing readers and no merge conflict surface for in-flight PRs that touch the English README.

Everything that is not prose was verified to be preserved exactly:

Check	Result
Install badge cells (101)	byte-identical to README.md
URLs (642)	byte-identical
<img> tags (9)	byte-identical
Relative links (68)	identical, all targets resolve on disk
In-page TOC anchors (74)	0 broken
Code fences (19)	count unchanged; only explanatory comments translated

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N) N

RFC issue number: N/A

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

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Note for maintainers

I saw that #4106 added Japanese through the Docusaurus i18n locale mechanism (docusaurus/i18n/ja/..., locales: ['en', 'ja']), and that there is currently no translated README anywhere in the repo. I went with a root-level README.ko.md because the root README is the first thing most people land on, and because it keeps the change to a single additive file.

If you would rather standardize on the Docusaurus locale approach, I am happy to rework this into a ko locale instead, or to close this in favor of an issue to discuss the direction first.