refactor(sgl-router): Replace once_cell with LazyLock in worker.rs and remove once_cell dependency from Cargo.toml (#8698)

sgl-router/Cargo.toml

@@ -25,7 +25,6 @@ dashmap = "6.1.0"
 http = "1.1.0"
 tokio = { version = "1.42.0", features = ["full"] }
 async-trait = "0.1"
-once_cell = "1.21"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "json", "chrono"] }
 tracing-log = "0.2"

sgl-router/src/core/worker.rs

@@ -1,14 +1,13 @@
 use super::{WorkerError, WorkerResult};
 use async_trait::async_trait;
 use futures;
-use once_cell::sync::Lazy;
 use serde_json;
 use std::fmt;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
-use std::sync::Arc;
+use std::sync::{Arc, LazyLock};
 
 // Shared HTTP client for worker operations (health checks, server info, etc.)
-static WORKER_CLIENT: Lazy<reqwest::Client> = Lazy::new(|| {
+static WORKER_CLIENT: LazyLock<reqwest::Client> = LazyLock::new(|| {
     reqwest::Client::builder()
         .timeout(std::time::Duration::from_secs(30)) // Default timeout, overridden per request
         .build()