文档: 新增 Docusaurus 官网与双语文档，README 切换为英文默认 (#39)

- 新建 docs-site/ Docusaurus 项目，支持 en + zh-Hans 双语
- 从 README 迁移内容为独立文档页面：
  - Getting Started（安装、快速开始）
  - Deployment（Docker、裸机、Nginx、配置参考）
  - Features（备份类型、存储后端、SAP HANA、多节点集群、通知）
  - Reference（API、CLI）
  - Development（开发、贡献）
- 自定义 BackupX 主题色、logo、落地页组件
- 新增 .github/workflows/docs.yml，Actions 自动构建并发布到 GitHub Pages
- README.md 切换为英文，中文版挪到 README.zh-CN.md，两者均精简为导航型
- 配置站点 URL：https://awuqing.github.io/BackupX/

docs-site/docs/getting-started/quick-start.md

@@ -0,0 +1,59 @@
+---
+sidebar_position: 2
+title: Quick Start
+description: Set up BackupX, add a storage target, create your first backup task.
+---
+
+# Quick Start
+
+After [installation](./installation), get a first backup running in five minutes.
+
+## 1. Open the console
+
+Browse to `http://your-server:8340`. The first time, you'll be guided through creating an admin account.
+
+## 2. Add a storage target
+
+Navigate to **Storage Targets → Add**. Pick a type and fill the required fields:
+
+| Type | Fields |
+|------|--------|
+| Alibaba OSS | Region + AccessKey ID/Secret + Bucket |
+| Tencent COS | Region + SecretId/SecretKey + Bucket (format `name-appid`) |
+| Qiniu Kodo | Region + AccessKey/SecretKey + Bucket |
+| S3-compatible | Endpoint + AccessKey + Bucket |
+| Google Drive | Client ID/Secret → click "Authorize" for OAuth flow |
+| WebDAV | URL + username/password |
+| FTP | Host + port + username/password |
+| Local disk | Target directory |
+| SFTP / Azure / Dropbox / OneDrive | Type-specific required fields; advanced options collapsed |
+
+:::tip
+For mainland China cloud vendors you only fill Region and AccessKey — BackupX assembles the endpoint automatically. Rclone-style providers separate required fields from advanced ones, with advanced collapsed by default.
+:::
+
+Click **Test Connection** to verify.
+
+## 3. Create a backup task
+
+Go to **Backup Tasks → New**. Three steps:
+
+1. **Basic info** — name, type, cron expression (leave empty for manual-only)
+2. **Source** — paths for file backup (multi-source supported), or connection info for databases
+3. **Storage & policy** — pick target(s), compression, retention days, encryption on/off
+
+Save, then click **Run Now** to trigger a test. Live logs stream on the **Backup Records** page.
+
+:::note
+Deleting a task also removes remote backup files to prevent orphans, but records are kept for audit.
+:::
+
+## 4. Configure notifications (optional)
+
+**Notifications** page supports email, webhook, and Telegram. Configure per-channel rules for success/failure events.
+
+## Next up
+
+- Explore [backup types](/docs/features/backup-types) and [storage backends](/docs/features/storage-backends)
+- Running SAP HANA? See [SAP HANA Support](/docs/features/sap-hana)
+- Managing many servers? See [Multi-Node Cluster](/docs/features/multi-node)