diff --git a/.DS_Store b/.DS_Store
index 9ef2c6d..de14da2 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/frontend/src/components/UserAuth.tsx b/frontend/src/components/UserAuth.tsx
index 782170d..7ff2394 100644
--- a/frontend/src/components/UserAuth.tsx
+++ b/frontend/src/components/UserAuth.tsx
@@ -27,8 +27,7 @@ export function UserAuth({ user, onOpenAuth, onLogout, onNavigateToAdmin }: User
   // Helper to get full avatar URL
   const getAvatarUrl = () => {
     if (!user?.avatar_url) return null;
-    const rootUrl = API_BASE_URL.replace('/api', '');
-    return `${rootUrl}/upload/${user.avatar_url}`;
+    return `/upload/${user.avatar_url}`;
   };
 
   return (
diff --git a/frontend/src/pages/admin/AdminLayout.tsx b/frontend/src/pages/admin/AdminLayout.tsx
index 572d0f5..6023a04 100644
--- a/frontend/src/pages/admin/AdminLayout.tsx
+++ b/frontend/src/pages/admin/AdminLayout.tsx
@@ -66,8 +66,7 @@ export function AdminLayout() {
   // Helper to get full avatar URL
   const getAvatarUrl = () => {
     if (!user?.avatar_url) return null;
-    const rootUrl = API_BASE_URL.replace('/api', '');
-    return `${rootUrl}/upload/${user.avatar_url}`;
+    return `/upload/${user.avatar_url}`;
   };
 
   // Load menus from backend
diff --git a/frontend/src/pages/admin/UserProfile.tsx b/frontend/src/pages/admin/UserProfile.tsx
index 6c211c3..22000ee 100644
--- a/frontend/src/pages/admin/UserProfile.tsx
+++ b/frontend/src/pages/admin/UserProfile.tsx
@@ -88,10 +88,9 @@ export function UserProfile() {
   // Construct full avatar URL
   const getAvatarUrl = () => {
     if (!userProfile?.avatar_url) return null;
+    // Use relative path to allow proxying (Vite/Nginx)
     // The backend returns a relative path like "user/1/avatar/avatar.png"
-    // The upload directory is mounted at /upload
-    const rootUrl = API_BASE_URL.replace('/api', '');
-    return `${rootUrl}/upload/${userProfile.avatar_url}?t=${new Date().getTime()}`;
+    return `/upload/${userProfile.avatar_url}?t=${new Date().getTime()}`;
   };
 
   return (