增加写作类题目的处理逻辑

ef_course_autopilot.py

@@ -310,6 +310,28 @@ def build_response_categorisation(task: TaskInfo) -> dict:
     return {"categorisation": result}
 
 
+def build_response_writing_challenge(task: TaskInfo) -> dict:
+    """writing-challenge: 写作挑战 — 优先使用expectedResponse，否则提交占位文本"""
+    expected = task.expected_response.get("contents", {}).get("writingChallenge", {})
+    if expected:
+        return {"writingChallenge": expected}
+
+    # 回退：提交一段较长占位文本（确保满足最低字数要求）
+    return {
+        "writingChallenge": {
+            "userInput": (
+                "I think this is a good topic. There are many things to consider "
+                "when writing about this subject. First of all, it is important to "
+                "understand the main ideas and think carefully about the best way to "
+                "express your thoughts. In my opinion, practice is the key to success "
+                "and everyone should try their best to improve their skills every day. "
+                "This is why I believe that learning English is very useful for "
+                "communication with people from different countries and cultures."
+            ),
+        }
+    }
+
+
 # 任务类型 → 答题策略映射
 RESPONSE_BUILDERS = {
     "media-with-time-markers": build_response_media_with_time_markers,
@@ -322,6 +344,7 @@ RESPONSE_BUILDERS = {
     "multiple-choice": build_response_multiple_choice,
     "text-highlights": build_response_text_highlights,
     "categorisation": build_response_categorisation,
+    "writing-challenge": build_response_writing_challenge,
 }