feat(TrafficRoutes, App): implement interface speed test route and UI integration; update error handling for interface measurement

frontend/src/App.jsx

@@ -36,6 +36,7 @@ import BillingManager from './BillingManager';
 import CommunitiesManager from './CommunitiesManager';
 import NetworkConfigManager from './NetworkConfigManager';
 import MikrotikTools from './MikrotikTools.jsx';
+import InterfaceSpeedTest from './InterfaceSpeedTest.jsx';
 import Dashboard from './Dashboard';
 import TrafficDashboard from './TrafficDashboard.jsx';
 import NetworkMapDashboard from './NetworkMapDashboard.jsx';
@@ -228,6 +229,7 @@ function MainLayout() {
         { id: 'auto-urls', title: t('autoUrls'), path: '/auto-urls', icon: IconDownload },
         { id: 'mikrotik-backups', title: t('mikrotikBackups'), path: '/mikrotik-backups', icon: IconDatabase },
         { id: 'mikrotik-tools', title: 'MikroTik Инструменты', path: '/mikrotik-tools', icon: IconNetwork },
+        { id: 'interface-speed', title: 'Скорость интерфейсов', path: '/interface-speed', icon: IconNetwork },
         { id: 'ping-services', title: t('pingServices'), path: '/ping-services', icon: IconNetwork }
       ]
     },
@@ -395,6 +397,7 @@ function MainLayout() {
             <Route path="/easy-switch" element={<EasySwitchManager />} />
             <Route path="/mikrotik-backups" element={<MikrotikBackupsManager />} />
             <Route path="/mikrotik-tools" element={<MikrotikTools />} />
+            <Route path="/interface-speed" element={<InterfaceSpeedTest />} />
             <Route path="/ping-services" element={<PingServicesManager />} />
             <Route path="/settings" element={<SettingsPage />} />
             <Route path="/" element={<Navigate to="/dashboard" replace />} />
@@ -553,6 +556,7 @@ function MainLayout() {
                 <Route path="/easy-switch" element={<EasySwitchManager />} />
                 <Route path="/mikrotik-backups" element={<MikrotikBackupsManager />} />
                 <Route path="/mikrotik-tools" element={<MikrotikTools />} />
+                <Route path="/interface-speed" element={<InterfaceSpeedTest />} />
                 <Route path="/ping-services" element={<PingServicesManager />} />
                 <Route path="/settings" element={<SettingsPage />} />
                 <Route path="/" element={<Navigate to="/dashboard" replace />} />