Add Russian localization and i18n foundation

[DrMaks22]

Summary

This PR adds a lightweight Russian localization foundation for Brew Browser across both shipped shells: the Tauri/Svelte/Rust app and the native SwiftUI app. It is updated on upstream main through v0.7.1 / native 0.3.1, including the new Bundles feature.

The goal is not only Russian UI text, but a maintainable path for additional languages without pulling in a heavy i18n dependency.

What changed

• Added and expanded the project-native UI message layer:
  • Tauri/Svelte: src/lib/i18n/en.ts, src/lib/i18n/ru.ts, src/lib/i18n/messages.ts
  • native SwiftUI: L10n facade plus Localizable.strings / Localizable.xcstrings resources
• Localized visible UI across the app surfaces and the Bundles surface:
  • Dashboard, Library, Discover, Trending, Snapshots, Services, Activity, Settings, package detail, Bundles, bundle detail, confirmations, network/security/update/GitHub flows
• Added Russian bundle prose overlays for the curated Bundles catalog in both builds:
  • src-tauri/data/bundles.ru.json
  • native/Sources/BrewBrowserKit/Resources/bundles.ru.json
• Kept recipe/source data stable and language-neutral:
  • package tokens, brew commands, route/storage/API names, URLs, CLI flags, model/provider/product names are not translated
  • formula/cask semantics are preserved and rendered as Russian UI labels where the value is a user-facing type badge
• Made live Bundles locale-aware without mixing stale translations into fresh live data:
  • bundled recipes use the embedded bundles.<locale>.json overlay
  • live refresh applies bundles.<locale>.json only when the live host provides a matching overlay; otherwise it keeps live English recipe prose intact
• Updated CONTRIBUTING-bundles.md with the localization overlay contract and instructions for adding future languages.
• Fixed a recipe validation issue found while syncing with upstream Bundles: agentic-web-dev now declares the third-party anomalyco/tap required for opencode.
• Follow-up visual QA fixes from local installed builds:
  • Tauri Dashboard no longer exposes raw catalog source wire values such as (user-refreshed).
  • Tauri update-list kind badges now render Russian labels such as cask-пакет / формула without changing package identifiers or brew commands.
  • Native Dashboard no longer exposes the missing date.today key and translates user-refreshed as обновлён пользователем.
  • Added regression tests for these source/kind/date labels.

How future languages can be added

1. Add app UI messages for the new locale in the existing message layer:
   • Tauri/Svelte: add src/lib/i18n/<locale>.ts and route it through the current message helpers.
   • native SwiftUI: add/update <locale>.lproj/Localizable.strings and Localizable.xcstrings resources, then include any new resources in native/Package.swift.
2. Add Bundle prose overlays, not translated recipe files:
   • Tauri/Rust: src-tauri/data/bundles.<locale>.json
   • native SwiftUI: native/Sources/BrewBrowserKit/Resources/bundles.<locale>.json
3. Keep overlay patches keyed only by stable recipe IDs, setup step indexes, and link URLs.
4. Do not translate stable identifiers: package names, formula/cask wire values, brew commands, CLI flags, IDs, URLs, model/provider/product names.
5. For package-level prose enrichment, add locale-keyed overlays (enrichment.<locale>.json) instead of mutating the base English catalog; search/index code should keep stable package IDs and add localized text as an additional display/search layer.
6. Run the parity and project checks below.

Validation

Ran locally on this branch:

• npm run check ✅
• npm test ✅ — 8 files / 66 tests
• node scripts/validate-recipes.mjs ✅ — 9/9 recipes valid, regenerated all bundled bundles.json copies
• cargo test --manifest-path src-tauri/Cargo.toml ✅ — 691 passed, 6 ignored integration tests
• cd native && swift build ✅
• cd native && swift test ✅ — 204 Swift Testing tests passed
• TypeScript locale parity ✅ — en.ts / ru.ts: strict key and placeholder parity passed
• Native .strings parity ✅ — English/Russian resource parity passed in both native resource roots
• Bundle overlay parity ✅ — Russian overlay covers all bundled recipe IDs in both Tauri and native resources
• JSON / .xcstrings structural parse ✅
• git diff --check ✅
• Local installed-build smoke/visual QA ✅:
  • Tauri installed as /Applications/Brew Browser RU.app (com.zerologic.brew-browser, 0.7.1)
  • Native installed as /Applications/Brew Browser Native RU.app (com.zerologic.brew-browser-native, 0.3.1)
  • Checked Dashboard, Catalog, Trending, Snapshots, Activity, Bundles and native Dashboard after install.

Notes:

• Tauri release bundling locally reaches the .app bundle, then fails only at Developer ID signing because the maintainer certificate Developer ID Application: Michael Sitarzewski (7JQGQ7CRH8) is not present on this machine. For local visual QA I ad-hoc signed the app bundle; this does not change repo code or the maintainer release process.
• Russian quality lint still reports heuristic warnings for preserved product/technology names such as Apple Silicon, Stable Diffusion, Flux, ComfyUI, OrbStack, Homebrew, GitHub, OSV.dev. I reviewed those manually and left them as non-translatable domain terms.
• Source plural scanner is clean for src. On native sources it flags the centralized L10n helper methods themselves; those helpers contain explicit Russian plural forms and are intentional.

Maintainer-facing notes

• This PR intentionally keeps the localization layer small and local to the repo.
• Bundle recipes remain the canonical source contract; localized overlays are optional, narrow patches.
• Unknown locales fall back to English.
• Live Bundles avoid mixing newer live recipes with older embedded translations unless a matching live locale overlay exists.

[DrMaks22]

Fresh installed-build QA pass after syncing to v0.7.1 / native 0.3.1:

• Installed and launched Tauri locally as /Applications/Brew Browser RU.app (com.zerologic.brew-browser, 0.7.1).
• Installed and launched native SwiftUI locally as /Applications/Brew Browser Native RU.app (com.zerologic.brew-browser-native, 0.3.1).
• Local Tauri .app was ad-hoc signed for QA because the maintainer Developer ID cert is not available on my machine; the build otherwise reaches the release app bundle.
• Visual QA found and fixed three RU polish regressions:
  • Tauri Dashboard no longer exposes (user-refreshed).
  • Tauri update-list type badges now render cask-пакет / формула in Russian UI.
  • Native Dashboard no longer exposes the missing date.today key and renders обновлён пользователем.
• Re-ran checks after the fixes:
  • npm run check ✅
  • npm test ✅ — 8 files / 66 tests
  • cd native && swift build ✅
  • cd native && swift test ✅ — 204 tests

No maintainer comments/reviews were present when I checked; PR is still mergeable from GitHub's perspective.