V 1.6.0 fix: Tagesregen per MAX (kumulierter Tageszähler, Reset um Mitternacht)

Wochenwerte als Summe täglicher Maxima; /weather/stats mit Subquery über tägliche Maxima.

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

frontend/src/App.jsx

@@ -26,8 +26,8 @@ function buildUrls(timeRange) {
     const days  = timeRange.days || 1
     const path = days >= 7 ? 'daily-aggregated-range' : 'hourly-aggregated-range'
     return {
-      weatherUrl:   `${API_BASE}/weather/${path}?start=${start}&end=${end}`,
-      rainUrl:      null,    // TODO: Regen-Aggregation fuer Range implementieren
+      weatherUrl: `${API_BASE}/weather/${path}?start=${start}&end=${end}`,
+      rainUrl:    days < 7 ? `${API_BASE}/weather/daily-aggregated-range?start=${start}&end=${end}` : null,
       needsCurrent: true,
     }
   }