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/useAppointmentWebSocket.ts

@@ -7,6 +7,7 @@ import { useEffect, useRef, useCallback, useState } from 'react';
 import { useQueryClient } from '@tanstack/react-query';
 import { getCookie } from '../utils/cookies';
 import { getSubdomain } from '../api/config';
+import { getWebSocketUrl } from '../utils/domain';
 import { Appointment } from '../types';
 
 interface WebSocketMessage {
@@ -87,7 +88,7 @@ export function useAppointmentWebSocket(options: UseAppointmentWebSocketOptions
   }, [onConnected, onDisconnected, onError]);
 
   // Get WebSocket URL - not a callback to avoid recreating
-  const getWebSocketUrl = () => {
+  const getWsUrl = () => {
     const token = getCookie('access_token');
     const subdomain = getSubdomain();
 
@@ -95,11 +96,8 @@ export function useAppointmentWebSocket(options: UseAppointmentWebSocketOptions
       return null;
     }
 
-    // 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
-
-    return `${wsProtocol}//${wsHost}/ws/appointments/?token=${token}&subdomain=${subdomain}`;
+    // Use the getWebSocketUrl utility from domain.ts
+    return `${getWebSocketUrl()}appointments/?token=${token}&subdomain=${subdomain}`;
   };
 
   const updateQueryCache = useCallback((message: WebSocketMessage) => {
@@ -160,7 +158,7 @@ export function useAppointmentWebSocket(options: UseAppointmentWebSocketOptions
         return;
       }
 
-      const url = getWebSocketUrl();
+      const url = getWsUrl();
       if (!url) {
         console.log('WebSocket: Missing token or subdomain, skipping connection');
         return;