fix: unify TaxBaik deployment around CI

TaxBaik.Web/Components/Admin/Layout/BlankLayout.razor

@@ -1,7 +1,3 @@
 @inherits LayoutComponentBase
 
-<MudThemeProvider />
-<MudDialogProvider />
-<MudSnackbarProvider />
-
 @Body

TaxBaik.Web/Components/Admin/Pages/Login.razor

@@ -9,8 +9,6 @@
 <PageTitle>로그인</PageTitle>
 
 <MudThemeProvider />
-<MudDialogProvider />
-<MudSnackbarProvider />
 
 <MudContainer MaxWidth="MaxWidth.Small" Class="d-flex align-center justify-center" Style="min-height: 100vh;">
     <MudPaper Class="pa-8" Elevation="3" Style="width: 100%; max-width: 400px;">

TaxBaik.Web/Services/AuthService.cs

@@ -36,6 +36,12 @@ public class AuthService
             return null;
         }
 
+        if (string.IsNullOrWhiteSpace(user.PasswordHash))
+        {
+            _logger.LogError("로그인 실패: 사용자 '{Username}'의 PasswordHash가 비어 있습니다.", username);
+            return null;
+        }
+
         if (!BCrypt.Net.BCrypt.Verify(password, user.PasswordHash))
         {
             _logger.LogWarning("로그인 시도: 잘못된 비밀번호 '{Username}'", username);