fix: agent-ws — safe socket.close() for non-WebSocket requests

HEAD/GET requests without WS upgrade caused 'socket.close is not a function'
crash → 500 errors in logs. Wrap close() in try-catch.

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

backend/src/agent-ws.ts

@@ -97,17 +97,22 @@ export const setupAgentWsRoute: FastifyPluginAsync = async (fastify) => {
   fastify.get('/ws/agent', { websocket: true }, async (connection: SocketStream, req) => {
     const socket = connection.socket as AgentSocket
 
+    // Если соединение не WebSocket (HEAD/GET без Upgrade) — просто закрываем
+    const safeClose = (code: number, reason: string) => {
+      try { socket.close(code, reason) } catch { /* HTTP-сокет — игнорируем */ }
+    }
+
     // Аутентификация по токену из заголовка
     try {
       const authHeader = req.headers.authorization ?? ''
       const token = authHeader.replace('Bearer ', '')
-      if (!token) { socket.close(1008, 'Unauthorized'); return }
+      if (!token) { safeClose(1008, 'Unauthorized'); return }
 
       const payload = fastify.jwt.verify(token) as {
         sub: string; role: string; workstation_id: string; hotel_slug: string
       }
 
-      if (payload.role !== 'agent') { socket.close(1008, 'Forbidden'); return }
+      if (payload.role !== 'agent') { safeClose(1008, 'Forbidden'); return }
 
       socket.agentId       = payload.sub
       socket.workstationId = payload.workstation_id
@@ -115,7 +120,7 @@ export const setupAgentWsRoute: FastifyPluginAsync = async (fastify) => {
       socket.isAlive       = true
 
     } catch {
-      socket.close(1008, 'Invalid token')
+      safeClose(1008, 'Invalid token')
       return
     }