feat(deploy): 在线更新 - 新增后台检查、强制备份迁移与失败自动回退

docker-compose.local.yml

@@ -9,6 +9,7 @@ services:
     environment:
       CANVAS_BACKEND_ADDR: ":8080"
       CANVAS_BACKEND_DATA_DIR: /data
+      CANVAS_SHUTDOWN_TIMEOUT: ${CANVAS_SHUTDOWN_TIMEOUT:-10m}
       CANVAS_DATABASE_DRIVER: ${CANVAS_DATABASE_DRIVER:-sqlite}
       DATABASE_URL: ${DATABASE_URL:-}
       REDIS_URL: ${REDIS_URL:-}
@@ -23,6 +24,7 @@ services:
     volumes:
       - backend-data:/data
     restart: unless-stopped
+    stop_grace_period: ${CANVAS_SHUTDOWN_TIMEOUT:-10m}
     develop:
       watch:
         - action: rebuild