feat: add complex user invitation and management features

- Implemented complex member and invitation schemas using Zod for validation.
- Created new API endpoints for inviting, accepting, revoking, and canceling complex user invitations.
- Developed handlers for managing complex users, including listing, inviting, revoking, and canceling invitations.
- Added frontend components for displaying and managing complex users and invitations.
- Introduced session storage management for pending invitations.
- Integrated Gravatar for user avatars based on email.
- Created database migration for complex invitations table.

apps/frontend/src/lib/api-client.ts

@@ -1,12 +1,10 @@
+import { sentinelClient } from '@better-auth/infra/client';
 import { createAuthClient } from 'better-auth/react';
 import * as api from './api';
-import { sentinelClient } from "@better-auth/infra/client";
 
 const apiBaseUrl = api.apiBaseUrl;
 
-const plugins = [
-  sentinelClient()
-]
+const plugins = [sentinelClient()];
 
 export const authClient = createAuthClient({
   baseURL: apiBaseUrl,