hoàn thành bước3.2. PDF Gallery (Dashboard)

frontend/src/types/index.ts

@@ -0,0 +1,20 @@
+export interface User {
+  id: number;
+  username: string;
+  email: string;
+  created_at: string;
+}
+
+export interface PDFItem {
+  id: number;
+  title: string;
+  total_pages: number | null;
+  created_at: string;
+}
+
+export interface PDFUploadResult {
+  filename: string;
+  success: boolean;
+  pdf: PDFItem | null;
+  error: string | null;
+}