feat(frontend): useAuth /auth/me, videos list + locked flag, VITE_API_URL

frontend/src/hooks/useAuth.ts

@@ -5,6 +5,7 @@ export interface User {
   id: number;
   email: string;
   nickname: string;
+  subscriptionLevel?: number;
 }
 
 interface AuthState {
@@ -12,6 +13,11 @@ interface AuthState {
   loading: boolean;
 }
 
+interface MeResponse {
+  success: boolean;
+  data: { user: User };
+}
+
 export function useAuth(): AuthState {
   const [user, setUser] = useState<User | null>(null);
   const [loading, setLoading] = useState(true);
@@ -19,8 +25,8 @@ export function useAuth(): AuthState {
   useEffect(() => {
     let cancelled = false;
 
-    apiFetch<User>('/profile')
-      .then((u) => { if (!cancelled) setUser(u); })
+    apiFetch<MeResponse>('/auth/me')
+      .then((res) => { if (!cancelled) setUser(res.data.user); })
       .catch(() => { if (!cancelled) setUser(null); })
       .finally(() => { if (!cancelled) setLoading(false); });