Implement relative paths for frontend API and WebSocket connections

- Created `.env.production` file to define relative paths for production deployment.
- Updated frontend API and WebSocket client to use environment variables for dynamic URL handling.
- Enhanced deployment scripts (`deploy-ubuntu.sh`, `start.sh`, `start.bat`) to generate `.env.production` automatically.
- Added `PRODUCTION_URLS.md` for documentation on production URL configuration and troubleshooting.

deploy-ubuntu.sh

@@ -82,6 +82,14 @@ echo -e "${GREEN}✓ Файлы скопированы${NC}"
 # 4. Сборка frontend
 echo -e "${YELLOW}[4/10] Сборка frontend...${NC}"
 cd frontend
+
+# Создаем .env.production для относительных путей
+cat > .env.production << 'EOF'
+# Production - используем относительные пути
+VITE_API_URL=/api
+VITE_WS_URL=
+EOF
+
 sudo -u "$REAL_USER" npm install
 sudo -u "$REAL_USER" npm run build
 cd ..