feat: 重构视频下载任务的触发逻辑，由简单的 tokio::sleep 迁移至调度器调度 (#529)

Cargo.toml

@@ -26,6 +26,7 @@ built = { version = "0.7.7", features = ["git2", "chrono"] }
 chrono = { version = "0.4.42", features = ["serde"] }
 clap = { version = "4.5.48", features = ["env", "string"] }
 cookie = "0.18.1"
+croner = "3.0.1"
 dashmap = "6.1.0"
 derivative = "2.2.0"
 dirs = "6.0.0"
@@ -69,6 +70,7 @@ strum = { version = "0.27.2", features = ["derive"] }
 sysinfo = "0.37.2"
 thiserror = "2.0.17"
 tokio = { version = "1.47.1", features = ["full"] }
+tokio-cron-scheduler = "0.15.1"
 tokio-stream = { version = "0.1.17", features = ["sync"] }
 tokio-util = { version = "0.7.16", features = ["io", "rt"] }
 toml = "0.9.7"