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/code_kb/retriever.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from typing import List
+
+from app.services.code_kb.adapter import CodeKnowledgeBaseAdapter
+from app.services.code_kb.schema import CodeSearchHit
+
+
+class CodeFunctionRetriever:
+    def __init__(self, adapter: CodeKnowledgeBaseAdapter) -> None:
+        self.adapter = adapter
+
+    def retrieve(
+        self,
+        query: str,
+        top_k: int = 8,
+        min_similarity: float = 0.0,
+    ) -> List[CodeSearchHit]:
+        return self.adapter.search_functions(
+            query=query,
+            top_k=top_k,
+            min_similarity=min_similarity,
+        )
+