新增 categorisation 任务类型支持

HAR 文件分析发现新的任务类型 categorisation（分类题），
新增对应的答题策略函数并注册到 RESPONSE_BUILDERS 字典中。
优先使用服务器返回的 expectedResponse，回退时提交空映射。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ef_course_autopilot.py

@@ -294,6 +294,22 @@ def build_response_flashcards(task: TaskInfo) -> dict:
     }
 
 
+def build_response_categorisation(task: TaskInfo) -> dict:
+    """categorisation: 分类题 — 优先使用expectedResponse，否则提交空映射"""
+    expected = task.expected_response.get("contents", {}).get("categorisation", {})
+    if expected:
+        return {"categorisation": expected}
+
+    # 回退：从task.detail获取items，全部设为未分类
+    cat = task.task_detail.get("categorisation", {})
+    items = cat.get("items", [])
+    result = {}
+    for item in items:
+        iid = item.get("id", "")
+        result[iid] = {"id": iid, "userInput": ""}
+    return {"categorisation": result}
+
+
 # 任务类型 → 答题策略映射
 RESPONSE_BUILDERS = {
     "media-with-time-markers": build_response_media_with_time_markers,
@@ -305,6 +321,7 @@ RESPONSE_BUILDERS = {
     "speaking-practice": build_response_speaking_practice,
     "multiple-choice": build_response_multiple_choice,
     "text-highlights": build_response_text_highlights,
+    "categorisation": build_response_categorisation,
 }