Add workflow support and enhance runtime configuration in models and services

- Introduce RuntimeModelResource and RuntimeKnowledgeBase classes to manage workflow resources.
- Update AssistantConfig to include workflow_model_resources and workflow_knowledge_bases for better integration.
- Refactor validation and processing logic in routes and services to accommodate workflow types.
- Implement dynamic variable support for workflow assistants and enhance graph normalization.
- Add ToolExecutor for reusable tool execution across different assistant types.
- Update various services to ensure compatibility with new workflow features and improve error handling.

backend/services/auth.py

@@ -109,6 +109,17 @@ def clear_auth_cookie(response: Response) -> None:
 
 async def require_admin(request: Request) -> AdminUser:
     user = verify_admin_token(request.cookies.get(settings.AUTH_COOKIE_NAME))
+    if not user:
+        authorization = request.headers.get("authorization", "")
+        scheme, _, encoded_credentials = authorization.partition(" ")
+        if scheme.lower() == "basic" and encoded_credentials:
+            try:
+                credentials = base64.b64decode(encoded_credentials).decode("utf-8")
+                username, separator, password = credentials.partition(":")
+                if separator:
+                    user = authenticate_admin(username, password)
+            except (ValueError, UnicodeDecodeError):
+                user = None
     if not user:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,