fix(tunnel): 移除 testkit 和 example 中残留的 idle_timeout 引用

apps/aether-gateway/examples/tunnel_runtime_harness.rs

@@ -25,13 +25,6 @@ struct Args {
     )]
     bind: String,
 
-    #[arg(
-        long,
-        default_value_t = 0,
-        env = "AETHER_TUNNEL_STANDALONE_PROXY_IDLE_TIMEOUT"
-    )]
-    proxy_idle_timeout: u64,
-
     #[arg(
         long,
         default_value_t = 15,
@@ -111,7 +104,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         TunnelControlPlaneClient::new(args.app_base_url),
         TunnelConnConfig {
             ping_interval,
-            idle_timeout: Duration::from_secs(args.proxy_idle_timeout),
             outbound_queue_capacity,
         },
         args.max_streams,

crates/aether-testkit/src/bin/capacity_curve_baseline.rs

@@ -306,7 +306,6 @@ async fn run_tunnel_curve(
         let tunnel = TunnelHarness::start(TunnelHarnessConfig {
             max_streams: (*limit).max(128),
             ping_interval: Duration::from_secs(15),
-            idle_timeout: Duration::ZERO,
             outbound_queue_capacity: 128,
             max_in_flight_requests: Some(*limit),
             distributed_request_gate: None,

crates/aether-testkit/src/tunnel.rs

@@ -12,7 +12,6 @@ use crate::server::SpawnedServer;
 pub struct TunnelHarnessConfig {
     pub max_streams: usize,
     pub ping_interval: Duration,
-    pub idle_timeout: Duration,
     pub outbound_queue_capacity: usize,
     pub max_in_flight_requests: Option<usize>,
     pub distributed_request_gate: Option<DistributedConcurrencyGate>,
@@ -23,7 +22,6 @@ impl Default for TunnelHarnessConfig {
         Self {
             max_streams: 128,
             ping_interval: Duration::from_secs(15),
-            idle_timeout: Duration::ZERO,
             outbound_queue_capacity: 128,
             max_in_flight_requests: None,
             distributed_request_gate: None,
@@ -53,7 +51,6 @@ impl TunnelHarness {
             TunnelControlPlaneClient::disabled(),
             TunnelConnConfig {
                 ping_interval: config.ping_interval,
-                idle_timeout: config.idle_timeout,
                 outbound_queue_capacity: config.outbound_queue_capacity,
             },
             config.max_streams,