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/api/platform.ts

@@ -0,0 +1,56 @@
+/**
+ * Platform API
+ * API functions for platform-level operations (businesses, users, etc.)
+ */
+
+import apiClient from './client';
+
+export interface PlatformBusiness {
+  id: number;
+  name: string;
+  subdomain: string;
+  tier: string;
+  is_active: boolean;
+  created_at: string;
+  user_count: number;
+}
+
+export interface PlatformUser {
+  id: number;
+  email: string;
+  username: string;
+  name?: string;
+  role?: string;
+  is_active: boolean;
+  is_staff: boolean;
+  is_superuser: boolean;
+  business: number | null;
+  business_name?: string;
+  business_subdomain?: string;
+  date_joined: string;
+  last_login?: string;
+}
+
+/**
+ * Get all businesses (platform admin only)
+ */
+export const getBusinesses = async (): Promise<PlatformBusiness[]> => {
+  const response = await apiClient.get<PlatformBusiness[]>('/api/platform/businesses/');
+  return response.data;
+};
+
+/**
+ * Get all users (platform admin only)
+ */
+export const getUsers = async (): Promise<PlatformUser[]> => {
+  const response = await apiClient.get<PlatformUser[]>('/api/platform/users/');
+  return response.data;
+};
+
+/**
+ * Get users for a specific business
+ */
+export const getBusinessUsers = async (businessId: number): Promise<PlatformUser[]> => {
+  const response = await apiClient.get<PlatformUser[]>(`/api/platform/users/?business=${businessId}`);
+  return response.data;
+};