Feat: Frontend-Overhaul E — Lane-Editor, Routing-Policy (hot-reload) & Latenz-Karte

Teil 1: VoiceLatencyCard auf dem Dashboard (GET /api/voice/metrics, C2) —
zeigt STT/Vision/Chat-TTFB/TTS mit p50/p95/last + count.

Teil 2: UI-editierbare Routing-Policy. Neuer routing_policy.py (hot-reload JSON
unter MODELS_DIR/mc2-routing.json, Env=Defaults, atomarer Write, Validierung).
router_logic, gateway_proxy und gateway.routing_summary lesen jetzt live via
load_policy(); routing_summary ist lane-bewusst (chat/coding statt altem auto).
Neue Endpoints GET/PUT /api/routing/policy.

Teil 3: LaneEditor.tsx als ZONE im Cockpit (chat/coding-Aliase + Schwellen +
fast_no_think, Speichern/Default-je-Feld); Gateway-Node zeigt die Lanes.

Verifiziert: npm run build (tsc strict) clean, FastAPI TestClient (GET/PUT,
Validierung, Persistenz, Hot-reload durch die API), venv-Smoke (Routing).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/views/DashboardView.tsx

@@ -6,6 +6,7 @@ import { RolesCard } from "@/components/dashboard/RolesCard"
 import { MemoryInputCard } from "@/components/dashboard/MemoryInputCard"
 import { TokenPerformanceCard } from "@/components/dashboard/TokenPerformanceCard"
 import { ServicesCard } from "@/components/dashboard/ServicesCard"
+import { VoiceLatencyCard } from "@/components/dashboard/VoiceLatencyCard"
 
 function ZoneLabel({ children }: { children: React.ReactNode }) {
   return <p className="mb-2 ml-0.5 text-[11px] font-semibold uppercase tracking-wider text-muted-foreground/60">{children}</p>
@@ -37,6 +38,12 @@ export function DashboardView() {
         </div>
       </section>
 
+      {/* Sprach-Latenz (Voice/Lucy-Pipeline, C2) */}
+      <section>
+        <ZoneLabel>Sprach-Latenz</ZoneLabel>
+        <VoiceLatencyCard />
+      </section>
+
       {/* Betrieb & Wissen */}
       <section>
         <ZoneLabel>Betrieb &amp; Wissen</ZoneLabel>