Add Russian translation

[deicer]

Summary

This PR adds full Russian localization support to the project, matching the existing language support pattern used for English, Chinese, and Japanese.

What was added

• Added Russian documentation:

  • README-ru.md
  • docs/ru/s01-s12

• Added Russian locale support in the web app:

  • web/src/i18n/messages/ru.json
  • locale wiring in app/server i18n
  • Russian-aware version/session metadata helpers

• Localized Russian UI across the learning site:

  • session titles
  • layer labels
  • simulator text
  • architecture/design decision content
  • visualizations and shared controls
  • compare/layers/timeline/home/version pages

• Added Russian scenario and annotation overrides:

  • web/src/data/scenario-ru.ts
  • web/src/data/annotation-ru.ts

• Regenerated extracted content:

  • web/src/data/generated/docs.json
  • web/src/data/generated/versions.json

Notes

The goal of this PR was not only to add Russian docs, but to make the Russian branch feel first-class and consistent with other supported languages across the site.

Technical identifiers such as command names, tool names, code symbols, and some runtime-specific terms were intentionally kept where preserving their original form improves clarity.

Verification

Ran:

• npm run extract
• npm run build

Build completed successfully and Russian routes were generated, including:

• /ru
• /ru/timeline
• /ru/compare
• /ru/layers
• /ru/s01 ... /ru/s12

Also manually and programmatically checked Russian lesson routes and interactive tabs/states to remove remaining untranslated user-facing text.

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