Docs: translate long-form pages to Vietnamese (nplusone, migrations)

[RinZ27]

Summary

Brought the two main CLI reference pages (nplusone.md and migrations.md) into the Vietnamese translation set.

Left the CLI commands, table structures, and JSON payload shapes alone to match the English version. Translated the context and rationale around them.

Type of change

• Docs / README / comments only (no runtime effect)

Test plan

Verified the markdown formatting and relative links render correctly on local preview.

Checklist

• I ran the full test suite locally (cd cli && pytest -q for Python, npm test for TypeScript) and it is green
• I added or updated tests that cover the change (bugfixes should get a regression test)
• If the change is user-facing I updated the CHANGELOG under ## [Unreleased]
• If the change touches the MCP tool contract (new tool, new arg, new error code) I updated the tool description in mcp_server.py and the relevant tests in test_mcp_server.py
• If this is a breaking change I called it out under ## Summary above and suggested a migration path

Related issues / discussions

Closes #80

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📥 Commits

Reviewing files that changed from the base of the PR and between 2a00eff and f8852e1.

📒 Files selected for processing (2)

• docs/i18n/rules/vi/migrations.md
• docs/i18n/rules/vi/nplusone.md

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