Title: Add i18n module with Russian localization and validation tools

Key features implemented:
- New i18n module with JSON-based message catalogs for multi-language support
- Added Russian (ru-RU) and English (en-US) localization files with 100+ messages
- PowerShell module ActivityWatch.Windows.I18n.psm1 with fallback mechanism
- Node.js validation and coverage analysis scripts for locale management
- Package.json configuration with semantic versioning and build tools
- README_RU.md documentation with integration examples and best practices

The implementation provides comprehensive internationalization support with automated validation, versioning, and fallback capabilities for robust multilingual deployments.

i18n/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "awatch-rus-i18n",
+  "version": "1.1.2",
+  "description": "Internationalization (i18n) module for AWatch-rus project",
+  "type": "module",
+  "scripts": {
+    "validate": "node scripts/validate-locales.js",
+    "coverage": "node scripts/check-coverage.js",
+    "extract": "node scripts/extract-keys.js",
+    "bump": "node scripts/bump-version.js"
+  },
+  "keywords": [
+    "i18n",
+    "localization",
+    "l10n",
+    "russian",
+    "activitywatch"
+  ],
+  "author": "AWatch-rus Team",
+  "license": "MIT",
+  "engines": {
+    "node": ">=16.0.0"
+  },
+  "devDependencies": {
+    "glob": "^10.3.0",
+    "jsonschema": "^1.4.1"
+  }
+}