v6 Phase A: Dashboard & Toolbar

- 'Dein Stack' zeigt echtes Modell (Dateiname) hinter coder/scout/vision.
- Top-News-Karte auf der Uebersicht (neben Stack).
- Toolbar-Update-Badges: /api/updates (OS via apt-Cache + Modell-Upgrades),
  klickbar -> Server bzw. News. compute_upgrades aus cookbook wiederverwendet.

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

static/index.html

@@ -33,6 +33,7 @@
     <header class="topbar">
       <span class="status-pill"><span id="swdot" class="dot"></span><span id="swlabel">verbinde…</span></span>
       <span class="spacer"></span>
+      <span id="update-badges" class="flex" style="gap:6px"></span>
       <span class="top-stat" id="top-active-text">Kein Modell geladen</span>
       <span class="sec-chip" id="sec-chip"><span data-ic="shield"></span><span id="sec-chip-tx">Nur im Heimnetz</span></span>
     </header>
@@ -50,7 +51,10 @@
           <div class="card" id="ov-health"></div>
           <div class="card" id="ov-quickstart"></div>
         </div>
-        <div class="card" id="ov-stack"></div>
+        <div class="grid grid-2">
+          <div class="card" id="ov-stack"></div>
+          <div class="card" id="ov-news"></div>
+        </div>
       </section>
 
       <section class="view" data-view="activity" hidden>