fix(gyms): saving no longer fails before the brand-colour migration; upload header image and logo instead of typing paths

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

views/admin/gyms/edit.php

@@ -21,6 +21,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     }
     if (!$errors) {
         $changed = db_gyms_update($pdo, $id, $data);
+        // Uploaded images that were replaced or removed are no longer referenced.
+        foreach (['hero_image', 'logo'] as $f) if (($item[$f] ?? '') !== ($data[$f] ?? '')) gyms_remove_image($item[$f] ?? '');
         session()->setFlashdata($changed ? 'success' : 'warning', $changed ? 'Ginásio atualizado.' : 'Nenhuma alteração.');
         header('Location: ' . base_url('views/admin/gyms/edit.php?id=' . $id));
         exit;
@@ -47,7 +49,7 @@ include __DIR__ . '/../../../includes/header.php';
         <button class="btn btn-sm btn-primary text-nowrap">Editar conteúdo deste</button>
     </form>
     <?php endif; ?>
-    <form method="POST" class="card shadow-sm"><div class="card-body">
+    <form method="POST" enctype="multipart/form-data" class="card shadow-sm"><div class="card-body">
         <?= csrf_field() ?>
         <?php include __DIR__ . '/_form.php'; ?>
         <div class="mt-4 d-flex gap-2">