feat: add schedule files upload

src/components/admin/schedule-file-upload/schedule-file-upload.component.html

@@ -0,0 +1,28 @@
+<app-configuration-card
+  [title]="'Загрузка расписания Excel'"
+  [isSaveEnabled]="selectedFiles.length > 0"
+  [saveFunction]="saveFunction()"
+  (onSaveFunction)="onUpload($event)">
+
+  <input type="file" #fileInput (change)="onFileSelected($event)" multiple accept=".xlsx, .xls" style="display: none;">
+
+  @if (fileLoading) {
+    <app-data-spinner/>
+  } @else {
+    <button mat-raised-button color="primary" (click)="onFileChooseClick()">
+      Выберите файлы
+      <mat-icon>attach_file</mat-icon>
+    </button>
+  }
+
+  @if (selectedFiles.length > 0) {
+    <div style="margin-top: 15px;">
+      <p>Выбранные файлы:</p>
+      <ul>
+        @for (file of selectedFiles; track $index) {
+          <li>{{ file.name }}</li>
+        }
+      </ul>
+    </div>
+  }
+</app-configuration-card>