refactor: 代理节点架构重构与功能增强

aether-proxy:
- 重构 main.rs，拆分为 app/state/hardware/net 模块
- setup.rs 拆分为 setup/tui.rs + setup/service.rs，支持 systemd 服务管理子命令
- 新增 delegate 端点，支持后端通过代理节点转发请求而非传统 CONNECT 代理
- 注册时上报硬件信息（CPU/内存/fd_limit）和估算最大并发数
- 心跳上报活跃连接数，支持远程下发 node_name 配置
- HTTP 转发时剥离 X-Forwarded-* 等敏感头部
- 切换到 rustls-tls，降低日志级别减少噪音

后端:
- 从 http_client.py 提取代理相关逻辑至 proxy_node/resolver.py
- 从 routes.py 提取业务逻辑至 proxy_node/service.py
- handler 支持 delegate 模式（通过代理节点 HTTP 端点转发而非 CONNECT 隧道）
- ProxyNode 模型新增 hardware_info 和 estimated_max_concurrency 字段

前端:
- 新增 HardwareTooltip 组件展示节点硬件信息
- 远程配置支持下发 node_name

aether-proxy/Cargo.toml

@@ -9,7 +9,8 @@ tokio = { version = "1", features = ["full"] }
 hyper = { version = "1", features = ["http1", "server"] }
 hyper-util = { version = "0.1", features = ["tokio", "http1", "server"] }
 http-body-util = "0.1"
-reqwest = { version = "0.12", features = ["json", "native-tls-vendored"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls", "stream"] }
+futures-util = "0.3"
 hmac = "0.12"
 sha2 = "0.10"
 subtle = "2"
@@ -31,6 +32,9 @@ rustls-pemfile = "2"
 rcgen = "0.13"
 ratatui = "0.30"
 crossterm = "0.28"
+url = "2"
+sysinfo = "0.32"
+libc = "0.2"
 
 [profile.release]
 lto = true