fix: questions_temp 表名为 questions_tem

app/Http/Controllers/Api/QuestionPdfController.php

@@ -72,7 +72,7 @@ class QuestionPdfController extends Controller
         try {
             // 1. Fetch questions from database (使用 questions_temp 临时表)
             $questions = DB::connection('remote_mysql')
-                ->table('questions_temp')
+                ->table('questions_tem')
                 ->whereIn('id', $questionIds)
                 ->get();