fix(backend) fix import error

backend/server/Cargo.toml

@@ -11,6 +11,7 @@ tracing = { version = "0.1.41", features = ["log"] }
 git2 = "0.20.0"
 chrono = "0.4.39"
 uuid = { version = "1.13.2", features = ["v4"] }
+cron = "0.15.0"
 
 [build-dependencies]
 git2 = "0.20.0"

backend/server/src/scheduler/tasks/basic.rs

@@ -1,10 +1,11 @@
-use crate::scheduler::task_func::TaskFunc;
-use crate::scheduler::tasks::Task;
-use chrono::{DateTime, Utc};
-use cron::Schedule;
 use std::error::Error;
 use std::str::FromStr;
 
+use crate::scheduler::{task_func::TaskFunc, tasks::Task};
+
+use chrono::{DateTime, Utc};
+use cron::Schedule;
+
 pub struct BasicTask {
     schedule: Schedule,
     func: Box<dyn TaskFunc>,