feat: 支持 acp-link 包进行 acp 通用的 remote-control (#292)

* fix: 修复超时问题

* feat: 添加 acp-link 代码

* refactor: 样式重构完成

* feat: RCS 添加 ACP 后端支持

- 新增 ACP WebSocket handler (agent 注册、EventBus 订阅)
- 新增 relay handler (前端 WS → acp-link 透传 + EventBus inbound 转发)
- 新增 SSE event stream 供外部消费者订阅 channel group 事件
- ACP REST 接口无鉴权 (agents、channel-groups)
- WebSocket 端点保留 token 鉴权
- SPA 路由 /acp/ 指向 acp.html

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

* feat: 添加 ACP 专属前端界面

- 新增 /acp/ SPA 页面 (agent 列表 + 实时交互)
- Agent 列表按 channel group 分组，显示在线状态
- 通过 RCS WebSocket relay 与 agent 通信
- Vite multi-page 构建 (index.html + acp.html)

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

* feat: acp-link 支持 RCS relay 双向通信

- rcs-upstream 新增 messageHandler 转发非控制消息
- server.ts 新增虚拟 WS + relay client state 处理 relay ACP 消息
- newSession/loadSession 补充 mcpServers 参数
- 连接成功后显示 ACP Dashboard URL

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

* refactor: 移除 FileExplorer 及文件操作相关代码

- 删除 FileExplorer 组件
- ACPMain 移除 Files tab，仅保留 Chat 和 History
- client.ts 移除 listDir/readFile/onFileChanges 等方法
- types.ts 移除 FileItem/FileContent/FileChange 等类型

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

* fix: 修复类型问题

* feat: RCS 后端统一 ACP/Bridge 注册逻辑

- store: EnvironmentRecord 增加 capabilities 字段、storeFindEnvironmentByMachineName 复用逻辑
- store: 新增 storeGetSessionOwners，支持未绑定 session 自动 claim
- environment: registerEnvironment 支持 ACP 复用已有记录，返回 session_id
- session: resolveOwnedWebSessionId 支持无 owner session 自动绑定
- acp-ws-handler: 新增 handleIdentify 支持 REST+WS 两步注册
- acp routes: /acp/relay 和 /acp/agents 支持 UUID 认证
- event-bus: 增加 error 类型 payload 日志

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

* feat: acp-link 改 REST 注册 + WS identify 两步流程

- rcs-upstream: 新增 registerViaRest() 通过 POST /v1/environments/bridge 注册
- rcs-upstream: WS 连接后发送 identify 替代 register，携带 agentId
- rcs-upstream: 入口链接改为 /code/?sid=${sessionId} 实现用户绑定
- server: 修复心跳跳过 relay 虚拟连接的 bug
- server: maxSessions 配置传入 RCS upstream

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

* feat: 前端统一 Chat 组件 + ACP 聊天界面重构

- 新增 chat/ 组件: ChatView, ChatInput, MessageBubble, ToolCallGroup, PermissionPanel, SessionSidebar, CommandMenu
- ACPMain: 重构支持完整 ACP 协议交互（session/prompt/permission）
- rcs-chat-adapter: 统一 bridge session SSE 适配器
- ACPClient: 增强 session 管理、permission 流程、streaming 支持
- index.css: 新增 chat 相关样式、动画、布局
- useCommands: 新增快捷命令 hook

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

* refactor: 删除 /acp/ 独立页面，ACP 聊天统一到 /code/:sessionId

- 删除 acp.html、acp-main.tsx 入口文件和 pages/acp/ 目录
- SessionDetail: ACP session 在同一页面渲染 ACPSessionDetail 组件
- App.tsx: ?sid= 参数自动调用 apiBind 绑定用户 UUID
- Dashboard: 统一 session 列表导航，ACP 显示紫色标签
- relay-client: 改用 UUID 认证替代 API token
- EnvironmentList: 显示 workerType 标签（ACP Agent / Claude Code）
- index.ts: 移除 /acp/ SPA 路由，vite.config 移除 acp 入口

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

* build: 更新构建及测试修复

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/remote-control-server/src/transport/ws-handler.ts

@@ -4,6 +4,7 @@ import type { SessionEvent } from "./event-bus";
 import { publishSessionEvent } from "../services/transport";
 import { log, error as logError } from "../logger";
 import { toClientPayload } from "./client-payload";
+import { config } from "../config";
 
 // Per-connection cleanup, keyed by sessionId (only one WS per session)
 interface CleanupEntry {
@@ -11,15 +12,20 @@ interface CleanupEntry {
   keepalive: ReturnType<typeof setInterval>;
   ws: WSContext;
   openTime: number;
+  lastClientActivity: number;
 }
 const cleanupBySession = new Map<string, CleanupEntry>();
 
 // Track all active WS connections for graceful shutdown
 const activeConnections = new Set<WSContext>();
 
-// Bridge sends keep_alive data frames every 120s. Send server-side keep_alive
-// every 60s to ensure the connection stays alive even without user messages.
-const SERVER_KEEPALIVE_INTERVAL_MS = 60_000;
+// Server-side keepalive interval (configurable via RCS_WS_KEEPALIVE_INTERVAL).
+// Sends data frames to keep reverse proxies from closing idle connections.
+const SERVER_KEEPALIVE_INTERVAL_MS = (config.wsKeepaliveInterval || 20) * 1000;
+
+// If no client data received within this threshold, the connection is
+// considered dead. Set to 3x keepalive to tolerate one missed interval.
+const CLIENT_ACTIVITY_TIMEOUT_MS = SERVER_KEEPALIVE_INTERVAL_MS * 3;
 
 /**
  * Convert internal EventBus event -> SDK message for bridge client.
@@ -33,6 +39,7 @@ function toSDKMessage(event: SessionEvent): string {
 /** Called from onOpen — subscribes to event bus, forwards outbound events to bridge WS */
 export function handleWebSocketOpen(ws: WSContext, sessionId: string) {
   const openTime = Date.now();
+  const lastClientActivity = Date.now();
   log(`[RC-DEBUG] [WS] Open session=${sessionId}`);
   activeConnections.add(ws);
 
@@ -79,6 +86,17 @@ export function handleWebSocketOpen(ws: WSContext, sessionId: string) {
       clearInterval(keepalive);
       return;
     }
+    // Check if client is still alive — close if no data received for too long
+    const silenceMs = Date.now() - lastClientActivity;
+    if (silenceMs > CLIENT_ACTIVITY_TIMEOUT_MS) {
+      log(`[WS] Client inactive for ${Math.round(silenceMs / 1000)}s on session=${sessionId}, closing dead connection`);
+      try {
+        ws.close(1000, "client inactive");
+      } catch {
+        clearInterval(keepalive);
+      }
+      return;
+    }
     try {
       ws.send('{"type":"keep_alive"}\n');
     } catch {
@@ -86,13 +104,18 @@ export function handleWebSocketOpen(ws: WSContext, sessionId: string) {
     }
   }, SERVER_KEEPALIVE_INTERVAL_MS);
 
-  cleanupBySession.set(sessionId, { unsub, keepalive, ws, openTime });
+  cleanupBySession.set(sessionId, { unsub, keepalive, ws, openTime, lastClientActivity });
 }
 
 /**
  * Called from onMessage — bridge sends newline-delimited JSON.
  */
 export function handleWebSocketMessage(ws: WSContext, sessionId: string, data: string) {
+  // Track client activity for dead-connection detection
+  const entry = cleanupBySession.get(sessionId);
+  if (entry) {
+    entry.lastClientActivity = Date.now();
+  }
   const lines = data.split("\n").filter((l) => l.trim());
   for (const line of lines) {
     try {