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/api/auth.ts

@@ -64,7 +64,7 @@ export interface User {
  * Login user
  */
 export const login = async (credentials: LoginCredentials): Promise<LoginResponse> => {
-  const response = await apiClient.post<LoginResponse>('/api/auth/login/', credentials);
+  const response = await apiClient.post<LoginResponse>('/auth/login/', credentials);
   return response.data;
 };
 
@@ -72,14 +72,14 @@ export const login = async (credentials: LoginCredentials): Promise<LoginRespons
  * Logout user
  */
 export const logout = async (): Promise<void> => {
-  await apiClient.post('/api/auth/logout/');
+  await apiClient.post('/auth/logout/');
 };
 
 /**
  * Get current user
  */
 export const getCurrentUser = async (): Promise<User> => {
-  const response = await apiClient.get<User>('/api/auth/me/');
+  const response = await apiClient.get<User>('/auth/me/');
   return response.data;
 };
 
@@ -87,7 +87,7 @@ export const getCurrentUser = async (): Promise<User> => {
  * Refresh access token
  */
 export const refreshToken = async (refresh: string): Promise<{ access: string }> => {
-  const response = await apiClient.post('/api/auth/refresh/', { refresh });
+  const response = await apiClient.post('/auth/refresh/', { refresh });
   return response.data;
 };
 
@@ -99,7 +99,7 @@ export const masquerade = async (
   hijack_history?: MasqueradeStackEntry[]
 ): Promise<LoginResponse> => {
   const response = await apiClient.post<LoginResponse>(
-    '/api/auth/hijack/acquire/',
+    '/auth/hijack/acquire/',
     { user_pk, hijack_history }
   );
   return response.data;
@@ -112,7 +112,7 @@ export const stopMasquerade = async (
   masquerade_stack: MasqueradeStackEntry[]
 ): Promise<LoginResponse> => {
   const response = await apiClient.post<LoginResponse>(
-    '/api/auth/hijack/release/',
+    '/auth/hijack/release/',
     { masquerade_stack }
   );
   return response.data;