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/EmailVerificationRequired.tsx

@@ -25,7 +25,7 @@ const EmailVerificationRequired: React.FC = () => {
     setSent(false);
 
     try {
-      await apiClient.post('/api/auth/email/verify/send/');
+      await apiClient.post('/auth/email/verify/send/');
       setSent(true);
       setTimeout(() => setSent(false), 5000); // Hide success message after 5 seconds
     } catch (err: any) {