fix(sports): fix group edit form 404 — remove /update suffix from action

Route is POST /sa/groups/{id}, not /sa/groups/{id}/update.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/SportsActivity/Views/groups/edit.php

@@ -7,7 +7,7 @@
 
 <?php $__template->section('content'); ?>
 
-<form method="POST" action="/sa/groups/<?= (int) $group->id ?>/update">
+<form method="POST" action="/sa/groups/<?= (int) $group->id ?>">
     <?= csrf_field() ?>
 
     <!-- Basic Information -->