docs(readme): sync Korean README's Android install guide link

[erishforG]

ELI5

The English README links an install guide next to the Android APK download. The Korean README only has the download link — this adds the missing guide link so Korean readers get the same information.

What Changed

docs/readme/README.ko.md line 233: added · [설치 가이드](https://www.onorca.dev/docs/android-apk) after the existing APK download link, matching the English README's line 233.

Why

#14978 (merged 2026-08-17) added the install guide link to the English README's mobile companion section. The Korean README's last full sync was #14124 (2026-08-12), before that change, so it drifted out of sync on this one line.

Linked Issue

No open issue for this — found while scanning for translation drift; docs-only, no code change.

Visual Proof

N/A — Markdown text only.

Testing

• I manually tested these changes locally
• Automated tests added/updated, or explained why not below

No tests applicable (documentation-only change). Verified by diffing against the current English README's equivalent line and confirming the Korean README's other Android/iOS mentions (the top badge table, line 39) are already in sync — only this one line had drifted.

AI Disclosure

Found and drafted with Claude (Anthropic) assistance, reviewed before submission.

Review

Single-line, docs-only change. No code, tests, or other translations touched.

Checklist

• This PR is small and focused
• I explained what changed and why (including ELI5)
• Before/after screenshots or videos attached for UI changes, or N/A with reason
• Self-reviewed for correctness, security, and performance
• Cross-platform, SSH/remote, and path/shortcut impact considered (or N/A) — docs only
• pnpm lint, pnpm typecheck, pnpm test, and pnpm build pass (or CI will cover; local preferred) — N/A, markdown only

[coderabbitai]

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 4ec6bbf and 5ca5a9e.

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• docs/readme/README.ko.md

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📝 Walkthrough

Walkthrough

The Korean README adds an installation guide link to the Android APK download entry.

Merge Risk: ⚪ Minimal · up to 5ca5a

This localized documentation update adds the missing Android installation-guide link to the Korean README; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes syncing the Korean README with the Android installation guide link.
Description check	✅ Passed	The description explains the change, rationale, testing, and scope clearly, but it does not provide the required linked issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[erishforG]

Duplicate of #15396 (same one-line fix for #15395, opened first without a linked issue). Closing this one and keeping #15396 as the canonical PR.