feat: Implement torch system via HTTP for multi-browser control

- Add /api/torch endpoints for torch state management
- Torch system uses HTTP polling instead of WebSocket
- Only browser with torch connects to MCP
- Other browsers disconnect and poll for torch state
- Auto-assign torch to first registered client
- Auto-reassign torch when holder disconnects

This approach requires no changes to WebMCP library.

frontend/src/App.vue

@@ -8,7 +8,8 @@ import FloatingTerminal from './components/FloatingTerminal.vue'
 import FloatingResponse from './components/FloatingResponse.vue'
 import FloatingVoice from './components/FloatingVoice.vue'
 import PwaInstallBanner from './components/PwaInstallBanner.vue'
-import { initWebMCP, getWebMCP, autoConnect, startTokenPolling, stopTokenPolling, connectWithToken } from './services/webmcp'
+import { initWebMCP, getWebMCP } from './services/webmcp'
+import { initTorch, destroyTorch } from './services/torch'
 import { endpoints } from './config/endpoints'
 import { initToolRegistry, activatePageTools, initToolsOnRefresh } from './services/toolRegistry'
 import { setTerminalControls } from './services/tools/handlers/terminalHandlers'
@@ -320,29 +321,12 @@ onMounted(async () => {
     })
   }
 
-  // Auto-connect to WebMCP if not connected
-  const webmcp = getWebMCP()
-  if (!webmcp?.isConnected) {
-    // Try auto-connect (works in both dev and HTTPS via API proxy)
-    const connected = await autoConnect()
-    if (connected) {
-      canvasStore.showNotification('WebMCP connected!', 'success')
-    } else {
-      // Fallback to polling (for older WebMCP versions without /token endpoint)
-      console.log('[App] Auto-connect failed, falling back to token polling...')
-      startTokenPolling(async (token) => {
-        console.log('[App] Token received, connecting...')
-        const success = await connectWithToken(token)
-        if (success) {
-          canvasStore.showNotification('WebMCP connected!', 'success')
-        }
-      })
-    }
-  }
+  // Initialize torch system (handles MCP connection based on torch state)
+  await initTorch()
 })
 
 onUnmounted(() => {
-  stopTokenPolling()
+  destroyTorch()
   if (statusReconnectTimeout) clearTimeout(statusReconnectTimeout)
   if (processingTimeout) clearTimeout(processingTimeout)
   if (sessionStartTimeout) clearTimeout(sessionStartTimeout)