perf: 重构敏感词过滤为DFA算法，并引入WebSocket房间频道鉴权Redis缓存

routes/channels.php

@@ -9,7 +9,9 @@ Broadcast::channel('App.Models.User.{id}', function ($user, $id) {
 
 // 聊天室房间 Presence Channel 鉴权与成员信息抓取
 Broadcast::channel('room.{roomId}', function ($user, $roomId) {
-    $room = \App\Models\Room::find($roomId);
+    $room = \Illuminate\Support\Facades\Cache::remember("room:meta:{$roomId}", 300, function () use ($roomId) {
+        return \App\Models\Room::find($roomId);
+    });
     if (! $room || ! $room->canUserEnter($user)) {
         return false;
     }