fix(v8.1): Kritische Bugs behoben — system_status, model-routing, UI

P0:
- hermes_agent: system_status Key-Mismatch behoben (cpu_pct→cpu.percent,
  ram_used_gb→ram.used/1024³, gtt analog) — zeigt jetzt echte Werte statt '?'
- guides-data: & in 4 Titel-Strings → & (Svelte text-node rendert keine HTML-Entities)

P1:
- hermes_agent: choose_model() um recherchier/such/vergleich/etc. erweitert;
  kein Downgrade wenn komplexes Modell bereits geladen
- routers/hermes: asyncio.get_event_loop() → get_running_loop() (Whisper+TTS)
- maintenance: llama-swap Update akzeptiert optionales sudo-PW via stdin;
  import os hinzugefügt (fix NameError in updates()); UpdateReq-Model
- ServerPanel: Engine-Update fragt jetzt nach sudo-PW (analog OS-Update)
- HermesPanel: Chat-History in sessionStorage (überlebt Reload);
  Stopp-Button während Hermes antwortet; Verlauf-löschen-Button
- ConnectPanel: opencode.json → opencode.jsonc; provider → providers;
  LAN-IP Override (localStorage) für NPM-Proxy-Setups

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

routers/hermes.py

@@ -148,7 +148,7 @@ async def transcribe_audio(audio: UploadFile = File(...)):
         tmp = Path(f.name)
         tmp.write_bytes(await audio.read())
     try:
-        segments, _ = await asyncio.get_event_loop().run_in_executor(
+        segments, _ = await asyncio.get_running_loop().run_in_executor(
             None, lambda: model.transcribe(str(tmp), language="de")
         )
         text = " ".join(s.text.strip() for s in segments).strip()
@@ -165,7 +165,7 @@ async def text_to_speech(body: dict):
     text = (body.get("text") or "").strip()
     if not text:
         return JSONResponse(status_code=400, content={"error": "Kein Text angegeben."})
-    audio = await asyncio.get_event_loop().run_in_executor(None, lambda: _tts(text))
+    audio = await asyncio.get_running_loop().run_in_executor(None, lambda: _tts(text))
     if audio is None:
         return JSONResponse(
             status_code=503,