feat(ui): add placeholder Wireless and Traffic routes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/routes/_authenticated/traffic.tsx

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+import { createFileRoute } from '@tanstack/react-router'
+import { BarChart3 } from 'lucide-react'
+
+export const Route = createFileRoute('/_authenticated/traffic')({
+  component: TrafficPage,
+})
+
+function TrafficPage() {
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center gap-2">
+        <BarChart3 className="h-5 w-5 text-text-muted" />
+        <h1 className="text-lg font-semibold text-text-primary">Traffic</h1>
+      </div>
+      <p className="text-sm text-text-secondary">
+        Bandwidth monitoring and traffic analysis — coming soon.
+      </p>
+    </div>
+  )
+}

frontend/src/routes/_authenticated/wireless.tsx

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+import { createFileRoute } from '@tanstack/react-router'
+import { Wifi } from 'lucide-react'
+
+export const Route = createFileRoute('/_authenticated/wireless')({
+  component: WirelessPage,
+})
+
+function WirelessPage() {
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center gap-2">
+        <Wifi className="h-5 w-5 text-text-muted" />
+        <h1 className="text-lg font-semibold text-text-primary">Wireless</h1>
+      </div>
+      <p className="text-sm text-text-secondary">
+        Wireless monitoring and statistics — coming soon.
+      </p>
+    </div>
+  )
+}