feat: 请求日志和 usage 记录中追踪代理节点信息

- 新增 resolve_proxy_info/get_proxy_label 提取脱敏的代理摘要
- StreamContext 增加 proxy_info 字段，流式/非流式全路径写入 metadata
- ProxyNode 缓存补充 name 字段，日志输出代理节点标识
- aether-proxy 连接和转发日志从 debug 提升为 info 级别
- TaskService 代理不可用日志补充 node_id 细节

aether-proxy/src/proxy/connect.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 use hyper::body::Incoming;
 use hyper::{Request, Response};
 use tokio::net::TcpStream;
-use tracing::{debug, warn};
+use tracing::{debug, info, warn};
 
 use crate::auth;
 use crate::config::Config;
@@ -53,7 +53,7 @@ pub async fn handle_connect(
         }
     };
 
-    debug!(target = %target_addr, "CONNECT tunnel establishing");
+    info!(target = %target_addr, "CONNECT tunnel establishing");
 
     // Connect to target
     let target_stream = match TcpStream::connect(target_addr).await {
@@ -74,7 +74,7 @@ pub async fn handle_connect(
 
                 match tokio::io::copy_bidirectional(&mut upgraded, &mut target).await {
                     Ok((from_client, from_target)) => {
-                        debug!(
+                        info!(
                             from_client,
                             from_target,
                             "CONNECT tunnel closed"

aether-proxy/src/proxy/plain.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 use http_body_util::{BodyExt, Full};
 use hyper::body::Incoming;
 use hyper::{Request, Response};
-use tracing::{debug, warn};
+use tracing::{debug, info, warn};
 
 use crate::auth;
 use crate::config::Config;
@@ -56,7 +56,7 @@ pub async fn handle_plain(
         }
     };
 
-    debug!(target = %target_addr, method = %req.method(), "HTTP proxy forwarding");
+    info!(target = %target_addr, method = %req.method(), "HTTP proxy forwarding");
 
     // Build outgoing request (strip proxy headers, use relative URI)
     let path_and_query = uri
@@ -116,6 +116,7 @@ pub async fn handle_plain(
 
     match sender.send_request(outgoing).await {
         Ok(resp) => {
+            info!(target = %target_addr, status = resp.status().as_u16(), "HTTP proxy response");
             // Stream the response body directly — no buffering
             let (parts, body) = resp.into_parts();
             let body: BoxBody = body

aether-proxy/src/proxy/server.rs

@@ -53,7 +53,7 @@ pub async fn run(
                     }
                 };
 
-                debug!(peer = %peer_addr, "new connection");
+                info!(peer = %peer_addr, "new connection");
 
                 let config = Arc::clone(&config);
                 let node_id = Arc::clone(&node_id);