feat(user): add user data management system with global state

- Implement user store with Zustand for global state management
- Create UserDataProvider component to initialize user data on app load
- Add useUserData hook for accessing and managing user data
- Refactor knowledge base list page to use new hooks

src/interfaces/database/flow.ts

@@ -1,5 +1,5 @@
 import { Edge, Node } from '@xyflow/react';
-import { IReference, Message } from './chat';
+import type { IReference, Message } from './chat';
 
 export type DSLComponents = Record<string, IOperator>;