中控备份支持上传 tar.gz 后再恢复，便于换机迁移。

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -36,6 +36,7 @@ from lib.backup_lib import (
     create_backup as create_hub_backup,
     list_backups as list_hub_backups,
     restore_backup as restore_hub_backup,
+    save_uploaded_backup as save_hub_uploaded_backup,
     start_backup_scheduler as start_hub_backup_scheduler,
 )
 from lib.bridge_client_lib import (
@@ -397,6 +398,16 @@ def api_hub_backup_restore():
     return jsonify(result), (200 if result.get("ok") else 400)
 
 
+@app.route("/api/settings/backup/hub/upload", methods=["POST"])
+@login_required
+def api_hub_backup_upload():
+    fs = request.files.get("file")
+    if fs is None or not getattr(fs, "filename", None):
+        return jsonify({"ok": False, "msg": "请选择备份文件"}), 400
+    result = save_hub_uploaded_backup(fs)
+    return jsonify(result), (200 if result.get("ok") else 400)
+
+
 @app.route("/api/settings/backup/instances", methods=["GET"])
 @login_required
 def api_backup_instances():