增加代码知识库；修复文档处理内容；增加API设置

rag-web-ui/backend/app/services/testing_pipeline/pipeline.py

@@ -33,13 +33,13 @@ def run_testing_pipeline(
     debug: bool = False,
     knowledge_context: Optional[str] = None,
     use_model_generation: bool = False,
+    llm_model: Any = None,
     max_items_per_group: int = 12,
     cases_per_item: int = 2,
     max_focus_points: int = 6,
     max_llm_calls: int = 10,
 ) -> Dict[str, Any]:
-    llm_model = None
-    if use_model_generation:
+    if use_model_generation and llm_model is None:
         try:
             from app.services.llm.llm_factory import LLMFactory