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/schemas/__init__.py

@@ -1,4 +1,10 @@
 from .api_key import APIKey, APIKeyCreate, APIKeyUpdate, APIKeyInDB
+from .model_config import (
+    ModelConfigCreate,
+    ModelConfigResponse,
+    ModelConfigUpdate,
+    ModelProviderOptionsResponse,
+)
 from .user import UserBase, UserCreate, UserUpdate, UserResponse
 from .token import Token, TokenPayload
 from .knowledge import KnowledgeBaseBase, KnowledgeBaseCreate, KnowledgeBaseUpdate, KnowledgeBaseResponse