Clarify Health Auto Export config uploads

src/App.php

@@ -312,6 +312,10 @@ final class App
 
     private function importHealthPayload(string $username, array $settings, array $payload): array
     {
+        if ($this->isHealthAutoExportConfigurationPayload($payload)) {
+            throw new RuntimeException('Diese JSON-Datei ist eine Health-Auto-Export-Konfiguration, aber kein Health-Datenexport. Bitte in Health Auto Export die Automation ausführen und die dabei erzeugte REST-API-Nutzlast senden.');
+        }
+
         $metrics = $this->healthMetricsFromPayload($payload);
         $workouts = $this->healthWorkoutsFromPayload($payload);
         $metricImport = $this->healthEventsFromMetrics($metrics);
@@ -441,6 +445,19 @@ final class App
         ];
     }
 
+    private function isHealthAutoExportConfigurationPayload(array $payload): bool
+    {
+        if (!isset($payload['exportDestination'], $payload['exportDataType'], $payload['urlString'])) {
+            return false;
+        }
+
+        $metrics = is_array($payload['metrics'] ?? null) ? $payload['metrics'] : [];
+        $hasOnlyMetricNames = $metrics !== [] && array_filter($metrics, 'is_array') === [];
+        $hasDataCollections = is_array($payload['workouts'] ?? null) || is_array($payload['data'] ?? null);
+
+        return $hasOnlyMetricNames && !$hasDataCollections;
+    }
+
     private function countHealthImportItems(array $metricImport, array $workoutImport): int
     {
         return count($metricImport['steps'] ?? [])