feat: aether-proxy 远程配置下发、连通性测试与 setup TUI

- 后端新增远程配置管理 API (PUT /config) 和连通性测试 API (POST /test)
- 前端新增远程配置编辑对话框和节点连通性测试按钮
- aether-proxy 支持通过心跳接收并热加载远程配置 (端口白名单、日志级别、心跳间隔、时间戳容差)
- aether-proxy 新增 TOML 配置文件支持和交互式 setup TUI
- aether-proxy 心跳 404 时自动重注册节点
- plain proxy 响应改为流式传输，减少内存缓冲
- 新增 remote_config 和 config_version 数据库字段及迁移

frontend/src/api/proxy-nodes.ts

@@ -1,5 +1,12 @@
 import apiClient from './client'
 
+export interface ProxyNodeRemoteConfig {
+  allowed_ports?: number[]
+  log_level?: string
+  heartbeat_interval?: number
+  timestamp_tolerance?: number
+}
+
 export interface ProxyNode {
   id: string
   name: string
@@ -12,6 +19,9 @@ export interface ProxyNode {
   proxy_url?: string
   proxy_username?: string
   proxy_password?: string  // 脱敏后的密码
+  // 远程配置（aether-proxy 节点）
+  remote_config: ProxyNodeRemoteConfig | null
+  config_version: number
   registered_by: string | null
   last_heartbeat_at: string | null
   heartbeat_interval: number
@@ -45,6 +55,13 @@ export interface ManualProxyNodeUpdateRequest {
   region?: string
 }
 
+export interface ProxyNodeTestResult {
+  success: boolean
+  latency_ms: number | null
+  exit_ip: string | null
+  error: string | null
+}
+
 export const proxyNodesApi = {
   async listProxyNodes(params?: { status?: string; skip?: number; limit?: number }): Promise<ProxyNodeListResponse> {
     const response = await apiClient.get<ProxyNodeListResponse>('/api/admin/proxy-nodes', { params })
@@ -65,4 +82,14 @@ export const proxyNodesApi = {
     const response = await apiClient.delete<{ message: string; node_id: string; cleared_system_proxy: boolean }>(`/api/admin/proxy-nodes/${nodeId}`)
     return response.data
   },
+
+  async testNode(nodeId: string): Promise<ProxyNodeTestResult> {
+    const response = await apiClient.post<ProxyNodeTestResult>(`/api/admin/proxy-nodes/${nodeId}/test`)
+    return response.data
+  },
+
+  async updateNodeConfig(nodeId: string, data: ProxyNodeRemoteConfig): Promise<{ node_id: string; config_version: number; remote_config: ProxyNodeRemoteConfig; node: ProxyNode }> {
+    const response = await apiClient.put<{ node_id: string; config_version: number; remote_config: ProxyNodeRemoteConfig; node: ProxyNode }>(`/api/admin/proxy-nodes/${nodeId}/config`, data)
+    return response.data
+  },
 }