fix: Use api.js in AuthContext for session persistence

- AuthContext was using fetch() directly with relative URLs
- Relative URLs went to nginx port (3098) instead of backend (8098)
- Now uses api.getCurrentProfile() which has correct API_URL
- Session persistence should work after browser refresh

frontend/src/context/AuthContext.jsx

@@ -1,4 +1,5 @@
 import { createContext, useContext, useState, useEffect } from 'react'
+import api from '../utils/api'
 
 const AuthContext = createContext(null)
 
@@ -18,19 +19,8 @@ export function AuthProvider({ children }) {
     }
 
     try {
-      const response = await fetch('/api/profiles/me', {
-        headers: {
-          'X-Auth-Token': token
-        }
-      })
-
-      if (response.ok) {
-        const profile = await response.json()
-        setUser(profile)
-      } else {
-        // Token invalid
-        localStorage.removeItem('authToken')
-      }
+      const profile = await api.getCurrentProfile()
+      setUser(profile)
     } catch (err) {
       console.error('Auth check failed:', err)
       localStorage.removeItem('authToken')