Initial commit: X-Server Mobile enterprise tool system

- Frontend: React 18 + TypeScript + Vite + Ant Design Mobile
- Backend: PHP 8.5 + Webman 2.x + MySQL + Redis
- i18n support: Chinese, English, Russian, Spanish, French
- Approval workflow engine
- Docker development environment
- Feishu integration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/.env.example

@@ -0,0 +1,23 @@
+# 应用配置
+APP_DEBUG=true
+APP_ENV=local
+
+# 数据库配置
+DB_HOST=127.0.0.1
+DB_PORT=3306
+DB_DATABASE=x_server_mobile
+DB_USERNAME=root
+DB_PASSWORD=
+
+# Redis 配置
+REDIS_HOST=127.0.0.1
+REDIS_PORT=6379
+REDIS_PASSWORD=
+REDIS_DATABASE=0
+
+# JWT 配置
+JWT_SECRET=your-secret-key-change-in-production
+
+# 飞书配置
+FEISHU_APP_ID=
+FEISHU_APP_SECRET=