docs: update Railway one-click deploy template URL

[mvanhorn]

Summary

Updates the stale Railway one-click deploy template URL in the install/railway docs page across all five translations (en, ja, ko, zh-cn, zh-tw).

The [Railway template] reference link target changes from the old scheme https://railway.app/template/eopPyH?referralCode=qeEK5G to the current permalink https://railway.com/deploy/eopPyH?referralCode=qeEK5G. The ?referralCode=qeEK5G referral attribution is preserved.

Why this matters

Issue #395 reports that the Railway deploy template linked from the docs is dead. The maintainer confirmed in the thread that Railway changed its template permalink scheme: the old railway.app/template/<id> URLs no longer resolve, and the working permalink is now https://railway.com/deploy/eopPyH. New users following the docs hit a broken one-click deploy link.

Testing

N/A (documentation-only). No application code or behavior changes. The reference-link block and frontmatter are otherwise untouched; only the URL path was updated. A grep -r "railway.app/template" docs/ after the change returns no matches.

Fixes #395

[gemini-code-assist]

Code Review

This pull request updates the Railway template deployment URL from railway.app/template to railway.com/deploy across multiple localization files in the documentation, including English, Japanese, Korean, Simplified Chinese, and Traditional Chinese. There are no review comments, and I have no feedback to provide as the changes are correct and straightforward.

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[dahlia]

Thanks for your contribution!