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/features/sap-hana.md

@@ -0,0 +1,79 @@
+---
+sidebar_position: 3
+title: SAP HANA Support
+description: Two SAP HANA backup modes — managed hdbsql runner and native Backint protocol agent.
+---
+
+# SAP HANA Support
+
+BackupX provides two SAP HANA backup modes. Pick whichever fits your operations workflow.
+
+## Mode 1: hdbsql Runner (console-managed)
+
+Create a SAP HANA backup task in the Web console. The backend invokes `hdbsql` to execute the backup. Use this when BackupX should own the schedule.
+
+**Source configuration supports:**
+
+| Field | Options | Description |
+|-------|---------|-------------|
+| Backup type | `data` / `log` | Data or log backup |
+| Backup level | `full` / `incremental` / `differential` | Auto-disabled for log backups |
+| Parallel channels | `1 ~ 32` | Multi-path SQL (`BACKUP DATA USING FILE ('c1', 'c2', ...)`) |
+| Retry count | `1 ~ 10` | Exponential backoff (`5s × attempt²`) |
+| Instance number | Optional | Inferred from port or specified manually |
+
+## Mode 2: Backint Protocol Agent (HANA native)
+
+BackupX ships a built-in Backint Agent. SAP HANA calls it via the native `BACKUP DATA USING BACKINT` syntax, and data is routed automatically to any BackupX storage target (S3 / OSS / COS / WebDAV / 70+ backends).
+
+### 1. Parameter file
+
+```ini title="/opt/backupx/backint_params.ini"
+#STORAGE_TYPE = s3
+#STORAGE_CONFIG_JSON = /opt/backupx/storage.json
+#PARALLEL_FACTOR = 4
+#COMPRESS = true
+#KEY_PREFIX = hana-backup
+#CATALOG_DB = /opt/backupx/backint_catalog.db
+#LOG_FILE = /var/log/backupx/backint.log
+```
+
+### 2. Storage config (same schema as storage targets)
+
+```json title="/opt/backupx/storage.json"
+{
+  "endpoint": "https://s3.amazonaws.com",
+  "region": "us-east-1",
+  "bucket": "hana-prod",
+  "accessKeyId": "AKIA...",
+  "secretAccessKey": "..."
+}
+```
+
+### 3. Create the hdbbackint symlink
+
+```bash
+ln -s /opt/backupx/backupx /usr/sap/<SID>/SYS/global/hdb/opt/hdbbackint
+```
+
+### 4. Enable Backint in HANA `global.ini`
+
+```ini
+[backup]
+data_backup_using_backint = true
+catalog_backup_using_backint = true
+log_backup_using_backint = true
+data_backup_parameter_file = /opt/backupx/backint_params.ini
+log_backup_parameter_file = /opt/backupx/backint_params.ini
+```
+
+### 5. Manual CLI invocation (troubleshooting)
+
+```bash
+backupx backint -f backup  -i input.txt -o output.txt -p backint_params.ini
+backupx backint -f restore -i input.txt -o output.txt -p backint_params.ini
+backupx backint -f inquire -i input.txt -o output.txt -p backint_params.ini
+backupx backint -f delete  -i input.txt -o output.txt -p backint_params.ini
+```
+
+The Backint Agent maintains an `EBID ↔ object-key` catalog in a local SQLite DB. All operations follow the SAP HANA Backint protocol (`#PIPE` / `#SAVED` / `#RESTORED` / `#BACKUP` / `#NOTFOUND` / `#DELETED` / `#ERROR`).