fix(docs): match locale notice routes with POSIX separators

[dajiaohuang]

Fixes #201.

Summary

pnpm docs:check fails on Windows and passes on the Linux CI runner. The check builds the required source-notice route from a path.relative result, which separates with backslashes on Windows, so it looks for /spec/01-product\00-overview while the Chinese mirror links /spec/01-product/00-overview.

Cause

const englishRoute = `/spec/${relativePath.replace(/\.md$/, '')}`

On Windows relativePath is 01-product\00-overview.md. The mirror contains the POSIX route:

> **翻译说明：** 本页是与 [英文源规格](/spec/01-product/00-overview) 一一对应的机器辅助翻译。

so source.includes(...) never matches and every nested page is reported invalid. The three pages directly under docs/spec (00-baseline.md, NAV.md, README.md) have no separator and pass; the reported list contains exactly the other 74 files, which is the signature of the bug.

Reproduction

Windows, on main at 6e6d710e:

$ node docs/scripts/check-locales.mjs
Invalid Chinese source notices:
01-product\00-overview.md
... (74 entries)
$ echo $?
1

With this change:

$ node docs/scripts/check-locales.mjs
Verified 77 English/Chinese specification pairs.
$ echo $?
0

Changes

• docs/scripts/check-locales.mjs: normalize separators when assembling the notice route; split the check into noticeRoute and verifyLocalePairs, with the CLI body behind a main() guard so importing the module no longer runs the scan. Messages and exit codes are unchanged.
• docs/scripts/check-locales.test.mjs: covers the route normalization and the pair scan.
• docs/package.json: adds "test": "node --test".

Validation

• node docs/scripts/check-locales.mjs — exit 1 before, exit 0 after (77 pairs verified).
• node --test in docs/ — 2 tests pass. Against the unfixed script the suite fails, so it is bound to the fix.
• node scripts/check-release-docs.mjs — unaffected by this change (verified separately).
• git diff --check — clean; git ls-files --eol reports w/lf for the spec pages, so this is not a line-ending problem.

Notes for the maintainer

• The new test script uses Node's built-in runner, so it adds no dependency. ci.yml already runs pnpm -r --if-present test, which will now include the docs package; if you would rather keep the docs workspace out of that job, drop the script and keep the test file. No workflow file is modified.
• The route assertion is only a regression guard on Windows: on Linux (path.sep === '/') the normalization is a no-op and the test passed before the fix as well. The assertion that fails on every platform is the import of noticeRoute, since the unfixed script does not export it.
• Worth considering separately: ci.yml ignores docs/**, so only the docs-check workflow covers this path, and that workflow runs solely on ubuntu-latest — which is why a Windows-only failure can stay invisible. I have not changed any workflow.

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