feat: add "Open Registration" button for tournaments

Adds a new tournament workflow step between draft and start:
- draft → "فتح التسجيل" → registration (players can join)
- registration → "بدء البطولة" → in_progress

New route: POST /tournaments/{id}/open-registration
Sets status from 'draft' to 'registration' with audit log.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config/routes.php

@@ -72,6 +72,7 @@ return [
     'tournaments/{id}' => ['module' => 'tournaments', 'action' => 'show'],
     'tournaments/{id}/edit' => ['module' => 'tournaments', 'action' => 'edit'],
     'tournaments/{id}/update' => ['module' => 'tournaments', 'action' => 'update'],
+    'tournaments/{id}/open-registration' => ['module' => 'tournaments', 'action' => 'openRegistration'],
     'tournaments/{id}/start' => ['module' => 'tournaments', 'action' => 'start'],
     'tournaments/{id}/complete' => ['module' => 'tournaments', 'action' => 'complete'],
     'tournaments/{id}/cancel' => ['module' => 'tournaments', 'action' => 'cancel'],

modules/tournaments/controller.php

@@ -335,6 +335,31 @@ class TournamentsController
         Response::success('تم تحديث البطولة', '/tournaments/' . $id);
     }
 
+    public function openRegistration(array $params, string $method): void
+    {
+        Auth::requireCsrf();
+        $id = $params['id'];
+
+        $tournament = $this->db->selectOne('el3ab_tournaments', ['id' => "eq.{$id}"]);
+        if (!$tournament) {
+            Response::error('البطولة غير موجودة', '/tournaments');
+            return;
+        }
+
+        if ($tournament['status'] !== 'draft') {
+            Response::error('يمكن فتح التسجيل فقط للبطولات في حالة المسودة', '/tournaments/' . $id);
+            return;
+        }
+
+        $this->db->update('el3ab_tournaments', ['id' => "eq.{$id}"], [
+            'status' => 'registration',
+            'updated_at' => date('c'),
+        ]);
+
+        AuditLog::log('open_registration', 'tournament', $id, ['status' => 'draft'], ['status' => 'registration']);
+        Response::success('تم فتح التسجيل', '/tournaments/' . $id);
+    }
+
     public function start(array $params, string $method): void
     {
         Auth::requireCsrf();

modules/tournaments/views/show.php

@@ -53,6 +53,16 @@ $tabs['arbiter'] = 'أدوات الحكم';
         </div>
     </div>
     <div class="flex gap-2">
+        <?php if ($tournament['status'] === 'draft'): ?>
+            <form method="POST" action="/tournaments/<?= $tournament['id'] ?>/open-registration" style="display:inline;">
+                <input type="hidden" name="_csrf" value="<?= Auth::csrfToken() ?>">
+                <button type="submit" class="btn btn-info" onclick="return confirm('فتح التسجيل للاعبين؟')">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M16 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="8.5" cy="7" r="4"/><line x1="20" y1="8" x2="20" y2="14"/><line x1="23" y1="11" x2="17" y2="11"/></svg>
+                    فتح التسجيل
+                </button>
+            </form>
+        <?php endif; ?>
+
         <?php if (in_array($tournament['status'], ['draft', 'registration'])): ?>
             <form method="POST" action="/tournaments/<?= $tournament['id'] ?>/start" style="display:inline;">
                 <input type="hidden" name="_csrf" value="<?= Auth::csrfToken() ?>">