记录所有人在线时长：允许 user_position_id 为空，移除记录日志时的职务判断

app/Http/Controllers/ChatController.php

@@ -1049,11 +1049,8 @@ class ChatController extends Controller
      */
     private function tickDutyLog(User $user, int $roomId): void
     {
-        // 无在职职务，无需记录
+        // 无论有无职务，均记录在线流水
         $activeUP = $user->activePosition;
-        if (! $activeUP) {
-            return;
-        }
 
         // ① 优先找今日未关闭的开放日志，直接刷新时长
         $openLog = PositionDutyLog::query()
@@ -1091,7 +1088,7 @@ class ChatController extends Controller
 
         PositionDutyLog::create([
             'user_id' => $user->id,
-            'user_position_id' => $activeUP->id,
+            'user_position_id' => $activeUP?->id,
             'login_at' => $loginAt,
             'ip_address' => request()->ip(),
             'room_id' => $roomId,