feat(i18n): add initial Russian localization for documentation and site config

- Added full Russian translations for all main documentation sections () into .
- Sections translated include: key features, installation, getting started, all core concepts, advanced features, API reference, FAQ, links, additional modules, contributing, and license.
- Updated  to ensure language switching is available and Russian locale is active.
- Each Russian file preserves the structure and formatting of the original Markdown, with machine-aided draft translation for immediate use.
- Lays the groundwork for UI language switching (en/ru) and enables further manual translation refinement and review.

website/i18n/ru/docusaurus-plugin-content-docs/current/getting-started.md

@@ -0,0 +1,27 @@
+---
+sidebar_position: 3
+---
+
+# Быстрый старт
+
+Минимальный пример регистрации и получения зависимости:
+
+```dart
+import 'package:cherrypick/cherrypick.dart';
+
+class AppModule extends Module {
+  @override
+  void builder(Scope currentScope) {
+    bind<ApiClient>().toInstance(ApiClientMock());
+    bind<String>().toProvide(() => "Hello, CherryPick!");
+  }
+}
+
+final rootScope = CherryPick.openRootScope();
+rootScope.installModules([AppModule()]);
+
+final greeting = rootScope.resolve<String>();
+print(greeting); // напечатает: Hello, CherryPick!
+
+await CherryPick.closeRootScope();
+```