perf: 优化接龙接口，加上事务锁

app/Http/Controllers/Api/DialogController.php

@@ -2180,9 +2180,10 @@ class DialogController extends AbstractController
             return Base::retError('内容最大不能超过200000字');
         }
         //
-        $userid = $user->userid;
+        return AbstractModel::transaction(function () use ($user, $uuid, $dialog_id, $list, $text) {
             if ($uuid) {
                 $dialogMsg = WebSocketDialogMsg::whereDialogId($dialog_id)
+                    ->lockForUpdate()
                     ->whereType('word-chain')
                     ->orderByDesc('created_at')
                     ->where('msg', 'like', "%$uuid%")
@@ -2196,6 +2197,8 @@ class DialogController extends AbstractController
                     return $result;
                 }, []);
                 $list = array_reverse(array_values($list));
+            } else {
+                $uuid = Base::generatePassword(36);
             }
             //
             usort($list, function ($a, $b) {
@@ -2205,10 +2208,11 @@ class DialogController extends AbstractController
             $msgData = [
                 'text' => $text,
                 'list' => $list,
-            'userid' => $userid,
-            'uuid' => $uuid ?: Base::generatePassword(36),
+                'userid' => $user->userid,
+                'uuid' => $uuid,
             ];
             return WebSocketDialogMsg::sendMsg(null, $dialog_id, 'word-chain', $msgData, $user->userid);
+        });
     }
 
     /**