fix(backend): align weekly reset calculation with Sunday midnight UTC

contents/scripts/usage.sh

@@ -53,11 +53,19 @@ calculate_reset() {
   previous_calibrated="$(printf '%s' "$STATE_JSON" | jq -r --arg n "$name" '.[$n].calibrated // false')"
   detected="$(jq -n --argjson old "$previous_usage" --argjson new "$current_usage" --argjson oldreq "$previous_req" --argjson newreq "$current_req" '($old != null and (($new < ($old - 0.02)) or ($newreq < $oldreq)))')"
 
-  if [ "$previous_reset" -le 0 ]; then
+  if [ "$name" = "weekly" ] && [ "$previous_reset" -le 0 ]; then
+    # Ollama Cloud weekly reset avviene a mezzanotte UTC (inizio lunedì UTC).
+    RESET_AT="$(date -u -d "next Monday 00:00:00" +%s 2>/dev/null || echo "$((NOW + duration))")"
+    CALIBRATED=true
+  elif [ "$previous_reset" -le 0 ]; then
     RESET_AT=$((NOW + duration))
     CALIBRATED=false
   elif [ "$detected" = true ]; then
-    RESET_AT=$((NOW + duration))
+    if [ "$name" = "weekly" ]; then
+      RESET_AT="$(date -u -d "next Monday 00:00:00" +%s 2>/dev/null || echo "$((NOW + duration))")"
+    else
+      RESET_AT=$((NOW + duration))
+    fi
     CALIBRATED=true
   else
     RESET_AT="$previous_reset"