Add market occurrence delete confirmation

public/api/market-occurrence.php

@@ -37,7 +37,12 @@ if ($requestMethod === 'POST') {
         $scope = (string) ($payload['scope'] ?? '');
         $id = market_management_require_positive_id($payload['id'] ?? null, 'id');
         $fields = is_array($payload['fields'] ?? null) ? $payload['fields'] : [];
-        if ($scope === 'day') {
+        if (($payload['action'] ?? '') === 'delete') {
+            if (($payload['confirmation'] ?? '') !== 'DELETE') {
+                throw new InvalidArgumentException('Die Löschbestätigung muss exakt DELETE lauten.');
+            }
+            market_management_set_occurrence_archive($pdo, $id, true);
+        } elseif ($scope === 'day') {
             market_management_update_day($pdo, $id, $fields);
         } elseif (in_array($scope, ['occurrence', 'status', 'overview', 'participation', 'infrastructure', 'travel', 'notes'], true)) {
         $marketFields = [];