feat(2.0): Phase 4 — Hermes-Schicht (MC-Seite + Runbook)

MC-Seite: services/agent.py + routers/agent.py (GET /api/agent/status:
Gateway/WebUI-Reachability + Verdrahtungs-Hinweise), AgentView (Status-
Tiles, Hermes-oeffnen-Button, Offline-Hinweis). deploy/hermes-webui.service
(systemd-USER, :8787). Box-Runbook docs/HERMES_SETUP.md (hermes-webui
installieren, Brain=model:auto via Gateway, Tools/MCP verdrahten inkl.
mcp_mc+mcp_memory, SSH-Windows, LiteLLM-Caveat #26489).

Lokal verifiziert: agent/status + Frontend-Build + Browser (Hermes-View).
Box-Ausfuehrung der Verdrahtung steht aus (Runbook). Docs aktualisiert.

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

frontend/src/App.tsx

@@ -7,6 +7,7 @@ import { RoutingView } from "@/views/RoutingView"
 import { SystemView } from "@/views/SystemView"
 import { ConnectView } from "@/views/ConnectView"
 import { MemoryView } from "@/views/MemoryView"
+import { AgentView } from "@/views/AgentView"
 import { Placeholder } from "@/views/Placeholder"
 import { api, type Health } from "@/lib/api"
 import { cn } from "@/lib/utils"
@@ -96,7 +97,8 @@ export default function App() {
           {view === "system" && <SystemView />}
           {view === "connect" && <ConnectView />}
           {view === "memory" && <MemoryView />}
-          {!["models", "routing", "system", "connect", "memory"].includes(view) && (
+          {view === "agent" && <AgentView />}
+          {!["models", "routing", "system", "connect", "memory", "agent"].includes(view) && (
             <Placeholder title={active.label} hint={active.hint} />
           )}
         </main>