feat: Add Russian i18n translations and fix CORS + API endpoint issues

- Implemented full Russian translation (ru) for 8 major pages
- Added LanguageSwitcher component with language detection
- Translated: Navigation, Settings, Workflows, Credentials, Banner, Examples
- Fixed API endpoint path: changed to use sans-api-v1 client for /v1/ endpoints
- Fixed CORS: added http://localhost:8081 to ALLOWED_ORIGINS
- Added locales infrastructure with i18next and react-i18next
- Created bilingual JSON files (en/ru) for 4 namespaces
- 220+ translation keys implemented
- Backend CORS configuration updated in .env
- Documentation: I18N implementation guides and installation docs

start-backend.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# Skyvern Backend Starter Script
+# Port: 8000
+
+cd "$(dirname "$0")"
+
+echo "🚀 Запуск Skyvern Backend..."
+echo ""
+echo "Активация virtual environment..."
+source .venv/bin/activate
+
+echo "Проверка БД..."
+docker ps | grep skyvern-postgres || {
+    echo "❌ PostgreSQL не запущена! Запускаю..."
+    docker compose -f docker-compose.deps.yml up -d postgres
+    sleep 5
+}
+
+docker ps | grep skyvern-redis || {
+    echo "❌ Redis не запущена! Запускаю..."
+    docker compose -f docker-compose.deps.yml up -d redis
+    sleep 3
+}
+
+echo ""
+echo "✅ PostgreSQL: localhost:5433"
+echo "✅ Redis: localhost:6380"
+echo ""
+
+# Проверить .env
+if [ ! -f .env ]; then
+    echo "❌ Файл .env не найден! Создайте его из .env.example"
+    exit 1
+fi
+
+echo "Запуск uvicorn сервера..."
+echo "📍 Backend будет доступен на: http://localhost:8000"
+echo "📍 API Docs: http://localhost:8000/docs"
+echo ""
+echo "Для остановки нажмите Ctrl+C"
+echo ""
+
+# Запуск FastAPI приложения
+# Модуль: skyvern.forge.api_app:app
+uvicorn skyvern.forge.api_app:app \
+    --host 0.0.0.0 \
+    --port 8000 \
+    --reload \
+    --log-level info