Fix double /api/ prefix in API endpoint calls

When VITE_API_URL=/api, axios baseURL is already set to /api. However, all endpoint calls included the /api/ prefix, creating double paths like /api/api/auth/login/.

Removed /api/ prefix from 81 API endpoint calls across 22 files:
- src/api/auth.ts - Fixed login, logout, me, refresh, hijack endpoints
- src/api/client.ts - Fixed token refresh endpoint
- src/api/profile.ts - Fixed all profile, email, password, MFA, sessions endpoints
- src/hooks/*.ts - Fixed all remaining API calls (users, appointments, resources, etc)
- src/pages/*.tsx - Fixed signup and email verification endpoints

This ensures API requests use the correct path: /api/auth/login/ instead of /api/api/auth/login/

🤖 Generated with Claude Code

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

frontend/src/pages/platform/components/BusinessCreateModal.tsx

@@ -1,6 +1,7 @@
 import React, { useState } from 'react';
 import { X, Plus, Building2, Key, User, Mail, Lock } from 'lucide-react';
 import { useCreateBusiness } from '../../../hooks/usePlatform';
+import { getBaseDomain } from '../../../utils/domain';
 
 interface BusinessCreateModalProps {
   isOpen: boolean;
@@ -183,7 +184,7 @@ const BusinessCreateModal: React.FC<BusinessCreateModalProps> = ({ isOpen, onClo
                   className="flex-1 px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-l-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500"
                 />
                 <span className="px-3 py-2 bg-gray-100 dark:bg-gray-600 border border-l-0 border-gray-300 dark:border-gray-600 rounded-r-lg text-gray-500 dark:text-gray-400 text-sm">
-                  .lvh.me
+                  .{getBaseDomain()}
                 </span>
               </div>
               <p className="text-xs text-gray-500 dark:text-gray-400 mt-1">