v5 Phase 3: News-Quellen aufgeraeumt + Upgrade-Vorschlaege

- news.py: Git-Release-Feeds raus (b9745-Rauschen), Qualitaetsquellen rein
  (HuggingFace, r/LocalLLaMA, Simon Willison, Latent Space, Ahead of AI, The Batch).
- cookbook.py: /upgrades (matcht installierte alte Modelle gegen UPGRADES-Map) +
  /install-model (einzelnes Modell tauschen, GGUF dynamisch, optimaler ctx).
- news.js: 'Fuer dich: Upgrades'-Sektion oben (Modell X ersetzt dein Y, weil ... [Installieren]).

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

routers/news.py

@@ -18,10 +18,11 @@ router = APIRouter(prefix="/api", dependencies=[Depends(auth)])
 
 FEEDS = [
     ("HuggingFace", "https://huggingface.co/blog/feed.xml"),
-    ("llama.cpp", "https://github.com/ggml-org/llama.cpp/releases.atom"),
-    ("Ollama", "https://github.com/ollama/ollama/releases.atom"),
     ("r/LocalLLaMA", "https://www.reddit.com/r/LocalLLaMA/.rss"),
     ("Simon Willison", "https://simonwillison.net/atom/everything/"),
+    ("Latent Space", "https://www.latent.space/feed"),
+    ("Ahead of AI", "https://magazine.sebastianraschka.com/feed"),
+    ("The Batch", "https://www.deeplearning.ai/the-batch/rss.xml"),
 ]
 _UA = {"User-Agent": "Mozilla/5.0 (MissionControl NewsBot)"}
 _TTL = 1800  # 30 min