refactor: admin ui를 fluent v5와 html 기반으로 전환

TaxBaik.Web/Components/Site/Routes.razor

@@ -0,0 +1,14 @@
+@using Microsoft.AspNetCore.Components.Routing
+
+<Router AppAssembly="@typeof(Program).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(TaxBaik.Web.Components.Site.SiteLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>찾을 수 없음</PageTitle>
+        <LayoutView Layout="@typeof(TaxBaik.Web.Components.Site.SiteLayout)">
+            <p>요청한 페이지를 찾을 수 없습니다.</p>
+        </LayoutView>
+    </NotFound>
+</Router>