chore: bump version to v0.2.1

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ZhiXiao-Lin

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "a3s-gateway"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 authors = ["A3S Lab"]
 license = "MIT"

src/provider/kubernetes.rs

@@ -8,9 +8,10 @@
 
 #![cfg_attr(not(feature = "kube"), allow(dead_code))]
 use crate::config::{
-    GatewayConfig, KubernetesProviderConfig, LoadBalancerConfig, RouterConfig, ServerConfig,
-    ServiceConfig, Strategy,
+    GatewayConfig, LoadBalancerConfig, RouterConfig, ServerConfig, ServiceConfig, Strategy,
 };
+#[cfg(feature = "kube")]
+use crate::config::KubernetesProviderConfig;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;