feat: 增加保存默认应用程序功能

src/admin/Bootstrap.Admin/Pages/Views/Admin/Settings.razor

@@ -162,7 +162,7 @@
                 </div>
             </div>
             <div class="modal-footer text-right">
-                <button class="btn btn-secondary" type="button"><i class="fa fa-save"></i><span>保存</span></button>
+                <button class="btn btn-secondary" type="button" @onclick="SaveDefaultApp"><i class="fa fa-save"></i><span>保存</span></button>
             </div>
         </div>
     </div>

src/admin/Bootstrap.Admin/Pages/Views/Components/SettingsBase.cs

@@ -223,6 +223,22 @@ namespace Bootstrap.Admin.Pages.Views.Admin.Components
             ShowMessage("保存日志缓存设置", ret);
         }
 
+        /// <summary>
+        /// 保存是否开启默认应用设置
+        /// </summary>
+        protected void SaveDefaultApp()
+        {
+            var ret = DictHelper.SaveSettings(new BootstrapDict[]{
+                new BootstrapDict() {
+                    Category = "网站设置",
+                    Name = "默认应用程序",
+                    Code = Model.DefaultApp ? "1" : "0"
+                }
+            });
+            RootLayout?.OnWebFooterChanged(Model.Footer);
+            ShowMessage("保存默认应用程序", ret);
+        }
+
         /// <summary>
         /// 保存网站是否为演示模式
         /// </summary>