Fix DeepSeek V4 Flash/Pro thinking mode 400 error in multi-turn conversations. Automatically backfills reasoning_content on all assistant messages before sending to API. Covers all code paths: main loop, cron jobs, gateway sessions, and auxiliary tasks.
Fix DeepSeek V4 Flash/Pro thinking mode 400 error in multi-turn conversations. Automatically backfills reasoning_content on all assistant messages before sending to API. Covers all code paths: main loop, cron jobs, gateway sessions, and auxiliary tasks.