(int) env('QUESTION_BANK_TIMEOUT', 10), 'cache_ttl' => (int) env('QUESTION_BANK_CACHE_SECONDS', 300), 'retry' => (int) env('QUESTION_BANK_RETRY', 2), 'retry_delay' => (int) env('QUESTION_BANK_RETRY_DELAY', 200), 'mode' => env('QUESTION_BANK_MODE', 'local'), /** 知识点题量统计：教材章节顺序用哪一册（textbooks.semester，默认 2=下学期） */ 'kp_stats_semester' => (int) env('KP_STATS_SEMESTER', 2), ];