Weather: Replace wttr.in with Open-Meteo + structured logging

- Replace wttr.in (unreachable from Docker) with Open-Meteo API
  (free, no API key, reliable) with geocoding cache
- WMO weather codes mapped to German descriptions + emoji icons
- Add [WEATHER], [NEWS], [UNRAID], [DASHBOARD] log prefixes
- Structured integration status table on startup
- Suppress noisy httpx INFO logs (services log their own summaries)
- Add logging to unraid_service (was completely silent on errors)

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

server/routers/news.py

@@ -43,6 +43,7 @@ async def get_news_articles(
     # --- cache hit? -----------------------------------------------------------
     cached = await cache.get(key)
     if cached is not None:
+        logger.debug("[NEWS] Cache hit (key=%s)", key)
         return cached
 
     # --- cache miss -----------------------------------------------------------
@@ -51,8 +52,10 @@ async def get_news_articles(
 
     try:
         articles = await get_news(limit=limit, offset=offset, category=category, max_age_hours=get_settings().news_max_age_hours)
+        logger.info("[NEWS] Fetched %d articles (limit=%d, offset=%d, category=%s)",
+                    len(articles), limit, offset, category)
     except Exception as exc:
-        logger.exception("Failed to fetch news articles")
+        logger.exception("[NEWS] Failed to fetch articles")
         return {
             "articles": [],
             "total": 0,