푸터: VersionInfo injection 오류 수정

TaxBaik.Web/Pages/Shared/_Footer.cshtml

@@ -1,4 +1,6 @@
-@inject VersionInfo VersionInfo
+@{
+    var versionInfo = ViewContext.HttpContext.RequestServices.GetService(typeof(VersionInfo)) as VersionInfo;
+}
 
 <footer class="bg-light border-top mt-5 py-4">
     <div class="container">
@@ -31,7 +33,7 @@
             <a href="/taxbaik/privacy" class="text-decoration-none text-muted me-2">개인정보처리방침</a>
             <a href="/taxbaik/terms" class="text-decoration-none text-muted">이용약관</a>
             <div class="mt-2" style="font-size: 0.75rem; opacity: 0.7;">
-                🔄 버전: @VersionInfo.Version | 배포: @VersionInfo.Built
+                🔄 버전: @(versionInfo?.Version ?? "unknown") | 배포: @(versionInfo?.Built ?? "unknown")
             </div>
         </div>
     </div>