feat: 优化学习视频转写与字幕清洗

tests/test_seed.py

@@ -28,7 +28,7 @@ def test_seed_default_workflows_idempotent(tmp_path) -> None:
     demo = db.get_latest_workflow_version("demo")["definition"]
     assert demo["name"] == "视频字幕生成"
     demo_asr = next(node for node in demo["nodes"] if node["id"] == "asr")
-    assert demo_asr["params"]["model_path"] == "faster-whisper-large-v3"
+    assert demo_asr["params"]["model_path"] == "faster-whisper-large-v2"
     assert demo_asr["params"]["condition_on_previous_text"] is False
 
     # zh-direct：使用中文直出模型并开启翻译任务。