fix(im_llm): 代理绕过Docker内部hostname

backend/python/app/api/chat_service.py

@@ -2895,6 +2895,13 @@ async def _send_message_core(
 
 
 
+
+            # Defensive guard: 即使 model_id 指向 image/video 模型，若用户输入无媒体意图词，
+            # 强制回退到 text 默认模型。修复 bug：普通多轮对话被误判走图片生成。
+            if ai_model and ("image" in caps or "video" in caps) and not detect_media_intent(req.content):
+                logger.info("[chat] Override media-cap model {} -> text (no media intent in: {:.50r})".format(ai_model.name, req.content))
+                ai_model = resolve_auto_model("text", db)
+                caps = [c.lower() for c in (ai_model.capabilities or [])] if ai_model else []
             if ai_model and ("image" in caps or "video" in caps):