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/hooks/useUserNotifications.ts

@@ -6,6 +6,7 @@
 import { useEffect, useRef, useCallback } from 'react';
 import { useQueryClient } from '@tanstack/react-query';
 import { getCookie } from '../utils/cookies';
+import { getWebSocketUrl } from '../utils/domain';
 import { UserEmail } from '../api/profile';
 
 interface WebSocketMessage {
@@ -104,10 +105,8 @@ export function useUserNotifications(options: UseUserNotificationsOptions = {})
       wsRef.current.close();
     }
 
-    // Determine WebSocket host - use api subdomain for WebSocket
-    const wsProtocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
-    const wsHost = `api.lvh.me:8000`; // In production, this would come from config
-    const url = `${wsProtocol}//${wsHost}/ws/user/?token=${token}`;
+    // Build WebSocket URL dynamically
+    const url = getWebSocketUrl(`user/?token=${token}`);
 
     console.log('UserNotifications WebSocket: Connecting');
     const ws = new WebSocket(url);