fix(#2181 P0): 默认关闭VLM lite + 修复单测timeout assertion

1. 单测修复：#2180把doubao_timeout默认从30提到45后，3个单测还assert 30导致CI红，同步更新为45
   - tests/unit/test_config_base.py::test_default_doubao_config
   - tests/unit/test_api_settings.py
   - tests/unit/test_ai_client.py（两处doubao_timeout=30→45）

2. doubao_vision_use_lite 默认改为 False：
   实测方舟 doubao-seed-2-1-lite-260915 模型100%超时（45.1s read timeout，3次重试全挂），
   反而 pro (ep-20260721114705-b568m) 稳定25-38s一次成功。
   默认关闭lite，直接走pro避免每步多耗136s（lite 3次超时），整体从170s/步→35s/步。
   lite模型待方舟侧恢复或确认为模型名问题后再通过ENV开启。

packages/config/base.py

@@ -103,7 +103,7 @@ class SharedSettings(BaseSettings):
     doubao_vision_lite_model: str = (
         "doubao-seed-2-1-lite-260915"  # 快速视觉（Seed 2.1 Lite 原生多模态；原 vision-lite-250315 不可用）
     )
-    doubao_vision_use_lite: bool = True  # viral-video 图片分析默认用 lite 提速
+    doubao_vision_use_lite: bool = False  # #2181: lite视觉模型100%超时，默认关闭走pro（25-38s稳定返回）
     doubao_embedding_model: str = "doubao-embedding-vision-251215"  # 多模态向量化（原 large-text-240915 已 Retiring）
     doubao_video_model: str = "doubao-seedance-2-5-260628"
     doubao_video_timeout: int = 600  # 视频生成轮询总超时（秒）

tests/unit/test_ai_client.py

@@ -17,7 +17,7 @@ def mock_settings():
             doubao_api_key="test-api-key",
             doubao_model="doubao-pro-32k",
             doubao_base_url="https://ark.example.com/api/v3",
-            doubao_timeout=30,
+            doubao_timeout=45,
             doubao_max_retries=2,
         )
         yield mock
@@ -37,7 +37,7 @@ def client_without_key():
             doubao_api_key="",
             doubao_model="doubao-pro-32k",
             doubao_base_url="https://ark.example.com/api/v3",
-            doubao_timeout=30,
+            doubao_timeout=45,
             doubao_max_retries=2,
         )
         yield DoubaoClient()

tests/unit/test_api_settings.py

@@ -80,7 +80,7 @@ class TestSharedSettingsDefaults:
     def test_default_doubao_settings(self):
         s = SharedSettings()
         assert "doubao" in s.doubao_model
-        assert s.doubao_timeout == 30
+        assert s.doubao_timeout == 45  # #2180 默认提到45s
         assert s.doubao_max_retries == 2
 
 

tests/unit/test_config_base.py

@@ -110,7 +110,7 @@ class TestSharedSettingsDefaults:
     def test_default_doubao_config(self):
         """豆包默认配置"""
         s = self._make_settings()
-        assert s.doubao_timeout == 30
+        assert s.doubao_timeout == 45  # #2180 默认提到45s
         assert s.doubao_max_retries == 2
         assert "volces.com" in s.doubao_base_url