Add occurrence checklist submodule

public/api/market-occurrence.php

@@ -63,6 +63,13 @@ if ($requestMethod === 'POST') {
             $day = market_management_delete_day($pdo, $id);
             echo json_encode(['ok' => true, 'day' => $day]);
             exit;
+        } elseif (($payload['action'] ?? '') === 'update_checklist') {
+            $checklist = market_management_update_occurrence_checklist($pdo, $id, [
+                'items' => $payload['items'] ?? null,
+                'comment' => $payload['comment'] ?? null,
+            ]);
+            echo json_encode(['ok' => true, 'checklist' => $checklist], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+            exit;
         } elseif ($scope === 'day') {
             market_management_update_day($pdo, $id, $fields);
         } elseif (in_array($scope, ['occurrence', 'status', 'overview', 'participation', 'infrastructure', 'travel', 'notes'], true)) {