chore: remove computer use (re-applied after main merge)

The merge of main into this branch (0907d87) hit a modify/delete conflict
for the computer-use module — main removed it in 6761f31 while this branch
had extended it — and the conflict was resolved by keeping the branch's
copies, silently resurrecting the whole feature.

This re-applies 6761f31's removal on top of the browser-use work:
- deletes the computer-use server module, client panel, settings tab,
  desktop-agent websocket service, electron computerAgent, and the
  computer-semantics build scripts
- strips computer-use wiring from shared files (server/index.js, electron
  launcher/main, MainContent, settings, i18n) while preserving browser-use
- removes src/constants/featureFlags.ts (existed only for the CU menu flag)

browser-use (camoufox/noVNC) is untouched. typecheck passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/modules/websocket/services/desktop-agent-websocket.service.ts

@@ -1,51 +0,0 @@
-import type { WebSocket } from 'ws';
-
-import { desktopAgentRelay } from '@/modules/computer-use/index.js';
-import type { AuthenticatedWebSocketRequest } from '@/shared/types.js';
-import { parseIncomingJsonObject } from '@/shared/utils.js';
-
-/**
- * Handles the `/desktop-agent` websocket — the inbound side of the cloud
- * Computer Use relay. A linked CloudCLI desktop app connects here and registers
- * itself as the executor for this hosted environment. The server then forwards
- * `computer_*` actions via `desktopAgentRelay`, and the agent returns results as
- * `computer_relay_result` frames correlated by `id`.
- */
-export function handleDesktopAgentConnection(
-  ws: WebSocket,
-  request: AuthenticatedWebSocketRequest
-): void {
-  let registered = false;
-
-  ws.on('message', (rawMessage) => {
-    const data = parseIncomingJsonObject(rawMessage);
-    if (!data) {
-      return;
-    }
-    const kind = typeof data.kind === 'string' ? data.kind : typeof data.type === 'string' ? data.type : '';
-    if (kind === 'register' && !registered) {
-      const label = typeof data.label === 'string' && data.label.trim()
-        ? data.label.trim()
-        : request.user?.username
-          ? `desktop:${request.user.username}`
-          : 'desktop-agent';
-      registered = true;
-      console.log('[INFO] Desktop agent websocket registered:', label);
-      desktopAgentRelay.register(ws, label);
-      return;
-    }
-    if (kind === 'computer_relay_result' && typeof data.id === 'string') {
-      desktopAgentRelay.handleResult(
-        data.id,
-        (data as Record<string, unknown>).result,
-        typeof (data as Record<string, unknown>).error === 'string'
-          ? ((data as Record<string, unknown>).error as string)
-          : undefined
-      );
-    }
-  });
-
-  ws.on('close', () => {
-    console.log('[INFO] Desktop agent websocket disconnected');
-  });
-}

server/modules/websocket/services/websocket-server.service.ts

@@ -7,7 +7,6 @@ import { VIEWER_COOKIE_NAME } from '@/modules/browser-use/index.js';
 import { verifyWebSocketClient } from '@/modules/websocket/services/websocket-auth.service.js';
 import { handlePluginWsProxy } from '@/modules/websocket/services/plugin-websocket-proxy.service.js';
 import { handleShellConnection } from '@/modules/websocket/services/shell-websocket.service.js';
-import { handleDesktopAgentConnection } from '@/modules/websocket/services/desktop-agent-websocket.service.js';
 import { handleDesktopNotificationsConnection } from '@/modules/notifications/index.js';
 import type { AuthenticatedWebSocketRequest } from '@/shared/types.js';
 
@@ -89,11 +88,6 @@ export function createWebSocketServer(
       return;
     }
 
-    if (pathname === '/desktop-agent') {
-      handleDesktopAgentConnection(ws, incomingRequest);
-      return;
-    }
-
     if (pathname === '/desktop-notifications') {
       handleDesktopNotificationsConnection(ws, incomingRequest);
       return;