feat: add sample document data array with typed document structure

- Define Doc type representing documents with id, name, and binary data
 - Export sample documents array with example PDF, DOCX, and XLSX files
 - Use Uint8Array to simulate file binary content in-memory

src/client/dd-hub-react/src/_mock/_data.ts

@@ -1,3 +1,5 @@
+
+import { Doc } from 'src/api/document-service';
 import { Product } from 'src/api/product-service';
 import { Filter } from 'src/api/attribute-service';
 
@@ -212,6 +214,8 @@ export const _notifications = [
   },
 ];
 
+// ----------------------------------------------------------------------
+
 export const _products: Product[] = [
   {
     id: '1',
@@ -225,6 +229,8 @@ export const _products: Product[] = [
   }
 ];
 
+// ----------------------------------------------------------------------
+
 export const _filters: Filter[] = [
   { id: 1, label: 'Rechnungsnummer', name: 'invoiceNumber', type: 'VARCHAR' },
   { id: 2, label: 'Kundenname', name: 'customerName', type: 'INTEGER' },
@@ -239,3 +245,33 @@ export const _filters: Filter[] = [
   { id: 11, label: 'Lieferzeit', name: 'deliveryTime', type: 'TIME' },
   { id: 12, label: 'Letzte Aktualisierung', name: 'lastUpdated', type: 'DATETIME' }
 ];
+
+// ----------------------------------------------------------------------
+
+export const documents: Doc[] = [
+  {
+    id: 1,
+    name: "example1.pdf",
+    data: new Uint8Array([37, 80, 68, 70, 45])
+  },
+  {
+    id: 2,
+    name: "example2.pdf",
+    data: new Uint8Array([37, 80, 68, 70, 45, 49, 46])
+  },
+  {
+    id: 3,
+    name: "document1.docx",
+    data: new Uint8Array([80, 75, 3, 4, 20])
+  },
+  {
+    id: 4,
+    name: "spreadsheet1.xlsx",
+    data: new Uint8Array([80, 75, 3, 4, 20])
+  },
+  {
+    id: 5,
+    name: "report.docx",
+    data: new Uint8Array([80, 75, 3, 4, 20, 0, 6])
+  },
+];

src/client/dd-hub-react/src/api/document-service.ts

@@ -0,0 +1,5 @@
+export type Doc = {
+    id: number,
+    name: string,
+    data: Uint8Array
+}