fix: load i18n source without cache

[JounQin]

Summary

Related Issue

close #1480

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Timeless0911]

Can we directly readjson instead? I'm not quite sure about the performance difference between the two.

rspress/packages/plugin-auto-nav-sidebar/src/walk.ts

Lines 39 to 40 in bc68277

	// Don't use require to avoid require cache, which make hmr not work.
	sideMeta = (await fs.readJSON(metaFile, 'utf8')) as SideMeta;