系统设置增加备份恢复：凌晨3点自动备份，保留10天，含 env 与复盘图片。

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

app.py

@@ -7592,10 +7592,24 @@ try:
         exchange_key="okx",
         username=USERNAME,
         password=PASSWORD,
+        db_path=DB_PATH,
+        upload_folder=UPLOAD_FOLDER,
     )
 except Exception as _settings_err:
     print(f"[instance_settings] okx: {_settings_err}")
 
+try:
+    from lib.instance.backup_lib import start_backup_scheduler
+
+    start_backup_scheduler(
+        base_dir=BASE_DIR,
+        db_path_fn=lambda: DB_PATH,
+        upload_folder_fn=lambda: UPLOAD_FOLDER,
+        hour=3,
+    )
+except Exception as _backup_err:
+    print(f"[backup] scheduler: {_backup_err}")
+
 
 
 from lib.sim.register import install_sim_trading