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/auth.ts

@@ -0,0 +1,113 @@
+/**
+ * Authentication API
+ */
+
+import apiClient from './client';
+
+export interface LoginCredentials {
+  username: string;
+  password: string;
+}
+
+import { UserRole } from '../types';
+
+export interface MasqueradeStackEntry {
+  user_id: number;
+  username: string;
+  role: UserRole;
+  business_id?: number;
+  business_subdomain?: string;
+}
+
+export interface LoginResponse {
+  access: string;
+  refresh: string;
+  user: {
+    id: number;
+    username: string;
+    email: string;
+    name: string;
+    role: UserRole;
+    avatar_url?: string;
+    email_verified?: boolean;
+    is_staff: boolean;
+    is_superuser: boolean;
+    business?: number;
+    business_name?: string;
+    business_subdomain?: string;
+  };
+  masquerade_stack?: MasqueradeStackEntry[];
+}
+
+export interface User {
+  id: number;
+  username: string;
+  email: string;
+  name: string;
+  role: UserRole;
+  avatar_url?: string;
+  email_verified?: boolean;
+  is_staff: boolean;
+  is_superuser: boolean;
+  business?: number;
+  business_name?: string;
+  business_subdomain?: string;
+}
+
+/**
+ * Login user
+ */
+export const login = async (credentials: LoginCredentials): Promise<LoginResponse> => {
+  const response = await apiClient.post<LoginResponse>('/api/auth/login/', credentials);
+  return response.data;
+};
+
+/**
+ * Logout user
+ */
+export const logout = async (): Promise<void> => {
+  await apiClient.post('/api/auth/logout/');
+};
+
+/**
+ * Get current user
+ */
+export const getCurrentUser = async (): Promise<User> => {
+  const response = await apiClient.get<User>('/api/auth/me/');
+  return response.data;
+};
+
+/**
+ * Refresh access token
+ */
+export const refreshToken = async (refresh: string): Promise<{ access: string }> => {
+  const response = await apiClient.post('/api/auth/refresh/', { refresh });
+  return response.data;
+};
+
+/**
+ * Masquerade as another user
+ */
+export const masquerade = async (
+  username: string,
+  masquerade_stack?: MasqueradeStackEntry[]
+): Promise<LoginResponse> => {
+  const response = await apiClient.post<LoginResponse>(
+    `/api/users/${username}/masquerade/`,
+    { masquerade_stack }
+  );
+  return response.data;
+};
+
+/**
+ * Stop masquerading and return to previous user
+ */
+export const stopMasquerade = async (
+  masquerade_stack: MasqueradeStackEntry[]
+): Promise<LoginResponse> => {
+  const response = await apiClient.post<LoginResponse>(
+    '/api/users/stop_masquerade/',
+    { masquerade_stack }
+  );
+  return response.data;
+};