Initial commit: SmoothSchedule multi-tenant scheduling platform

This commit includes:
- Django backend with multi-tenancy (django-tenants)
- React + TypeScript frontend with Vite
- Platform administration API with role-based access control
- Authentication system with token-based auth
- Quick login dev tools for testing different user roles
- CORS and CSRF configuration for local development
- Docker development environment setup

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/hooks/usePlatform.ts

@@ -0,0 +1,41 @@
+/**
+ * Platform Hooks
+ * React Query hooks for platform-level operations
+ */
+
+import { useQuery } from '@tanstack/react-query';
+import { getBusinesses, getUsers, getBusinessUsers } from '../api/platform';
+
+/**
+ * Hook to get all businesses (platform admin only)
+ */
+export const useBusinesses = () => {
+  return useQuery({
+    queryKey: ['platform', 'businesses'],
+    queryFn: getBusinesses,
+    staleTime: 5 * 60 * 1000, // 5 minutes
+  });
+};
+
+/**
+ * Hook to get all users (platform admin only)
+ */
+export const usePlatformUsers = () => {
+  return useQuery({
+    queryKey: ['platform', 'users'],
+    queryFn: getUsers,
+    staleTime: 5 * 60 * 1000, // 5 minutes
+  });
+};
+
+/**
+ * Hook to get users for a specific business
+ */
+export const useBusinessUsers = (businessId: number | null) => {
+  return useQuery({
+    queryKey: ['platform', 'business-users', businessId],
+    queryFn: () => getBusinessUsers(businessId!),
+    enabled: !!businessId,
+    staleTime: 5 * 60 * 1000, // 5 minutes
+  });
+};