feat(i18n): add Russian (ru) locale for Desktop UI + CLI polish

[Dimapitaya]

Closes #52137

What

Adds a complete Russian (ru) locale for the Hermes Desktop UI and finishes the remaining English strings in the CLI/agent ru.yaml catalog.

Desktop (apps/desktop/src/i18n/)

• New ru.ts — full defineLocale({...}) translation of the main UI: common, boot, notifications, titlebar, settings (all sections), skills, agents, command center, messaging (all messenger field copy), profiles, cron, artifacts, sidebar, composer, status stack, updates, onboarding, model picker, shell, preview, assistant, prompts, errors.
• Includes fieldLabels + fieldDescriptions (defineFieldCopy({...})) for the settings panel, following the ja.ts pattern.
• Correct Russian pluralization (one / few / many) via a small plural() helper.
• Registered in types.ts (Locale union), catalog.ts (TRANSLATIONS), and languages.ts (LOCALE_OPTIONS + LOCALE_ALIASES: ru, ru-ru).

CLI (locales/ru.yaml)

• Translated the remaining English strings: Matrix /resume guidance messages and gateway status labels (Model/Context), plus the newer blocked_not_owner message.

Verification

• npx tsc -p apps/desktop --noEmit → clean (exit 0)
• npx vitest run --environment jsdom apps/desktop/src/i18n → 21/21 passing
• ru.yaml validated with a YAML parser; structurally matches en.yaml

Notes

• Desktop locales deep-merge over English (defineLocale), so any future key falls back to English gracefully.
• Partial by design where upstream copy is highly technical; no functional/runtime code touched — translation strings only.

[alt-glitch]

This was generated by AI during triage.

Duplicate of #40701 (earliest open canonical Russian Desktop locale). This adds the same apps/desktop/src/i18n/ru.ts desktop UI locale that the saturated ru-i18n cluster already tracks — prior siblings #53643 (closed) and #50083 (open) were deduped to #40701 for the identical addition. Also relates to the feature request #52137 and competing PRs #41677 / #50083. Maintainer picks which ru-locale PR to land.

[teknium1]

Thanks for supplying the Russian Desktop catalog and completing the CLI strings. The Desktop gap still exists on current main: apps/desktop/src/i18n/catalog.ts:7-11 has no ru registration.

Problems

• The added catalog is behind current en.ts: it omits common.expand, common.formatJson, and common.tryHint (apps/desktop/src/i18n/en.ts:28-30,43), as well as boot.errors.gatewayConnectionLost (apps/desktop/src/i18n/en.ts:79). defineLocale() merges English fallbacks (apps/desktop/src/i18n/define-locale.ts:39-40), so it remains functional but is not a complete Russian UI.
• The PR adds aliases without covering them in apps/desktop/src/i18n/languages.test.ts:6-42, which currently tests the alias/config contract for all existing Desktop locales.

Suggested changes

• Refresh ru.ts from current en.ts and translate the current missing keys, or label it partial.
• Add Russian alias, config-value, and runtime translation assertions beside the existing i18n tests.

This is an automated hermes-sweeper review.

[teknium1]

defineLocale() will make omitted keys fall back to English, but current main has keys absent from this catalog, including common.expand/formatJson/tryHint and boot.errors.gatewayConnectionLost in apps/desktop/src/i18n/en.ts:28-30,43,79. Please refresh this catalog from current en.ts or scope the PR as partial.