CUB-35: build add/edit filament modal with Angular Material Dialog

frontend/src/app/models/paged-response.model.ts

@@ -0,0 +1,13 @@
+/**
+ * Generic paged response wrapper matching the Extrudex backend PagedResponse<T>.
+ */
+export interface PagedResponse<T> {
+  /** The items in this page. */
+  items: T[];
+  /** Total number of items across all pages. */
+  totalCount: number;
+  /** The current page number (1-based). */
+  pageNumber: number;
+  /** The number of items per page. */
+  pageSize: number;
+}