feat: 增加自定义头像上传、自动压缩与自动清理功能，统一全站头像路径读取逻辑

app/Services/ChatStateService.php

@@ -131,7 +131,7 @@ class ChatStateService
     {
         $usernames = [];
         foreach ($this->getAllActiveRoomIds() as $roomId) {
-            $key   = "room:{$roomId}:users";
+            $key = "room:{$roomId}:users";
             $users = Redis::hkeys($key); // 只取 key（用户名），不取 value
             foreach ($users as $username) {
                 $usernames[] = $username;