작업중: W4 관리자 로그인 구현 (BCrypt 인증)

- Login.razor: BCrypt 기반 실제 비밀번호 검증
- TaxBaik.Admin.csproj: BCrypt.Net-Next 패키지 추가
- HttpContext.SignInAsync로 쿠키 인증 처리

주의: 아직 런타임 이슈 수정 필요

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

TaxBaik.Admin/Components/Pages/Login.razor

@@ -29,16 +29,65 @@
     </MudPaper>
 </MudContainer>
 
+@using Microsoft.AspNetCore.Authentication
+@using System.Security.Claims
+@using TaxBaik.Domain.Interfaces
+
 @code {
     private MudForm form;
     private bool isFormValid = false;
     private string errorMessage = "";
-
     private LoginModel model = new();
+    private bool isLoading = false;
+
+    [Inject]
+    private IAdminUserRepository AdminUserRepository { get; set; }
+
+    [Inject]
+    private NavigationManager NavigationManager { get; set; }
+
+    [Inject]
+    private HttpContextAccessor HttpContextAccessor { get; set; }
 
     private async Task HandleLogin()
     {
-        errorMessage = "로그인 기능은 준비 중입니다.";
+        if (!isFormValid) return;
+        isLoading = true;
+        errorMessage = "";
+
+        try
+        {
+            var user = await AdminUserRepository.GetByUsernameAsync(model.Username);
+            if (user == null || !BCrypt.Net.BCrypt.Verify(model.Password, user.PasswordHash))
+            {
+                errorMessage = "사용자명 또는 비밀번호가 올바르지 않습니다.";
+                isLoading = false;
+                return;
+            }
+
+            var claims = new List<Claim>
+            {
+                new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
+                new Claim(ClaimTypes.Name, user.Username)
+            };
+            var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
+            var authProperties = new AuthenticationProperties { IsPersistent = true };
+
+            await HttpContextAccessor.HttpContext.SignInAsync(
+                CookieAuthenticationDefaults.AuthenticationScheme,
+                new ClaimsPrincipal(claimsIdentity),
+                authProperties);
+
+            NavigationManager.NavigateTo("/taxbaik/admin/dashboard");
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"로그인 중 오류: {ex.Message}";
+        }
+        finally
+        {
+            isLoading = false;
+        }
     }
 
     private class LoginModel

TaxBaik.Admin/TaxBaik.Admin.csproj

@@ -13,6 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="MudBlazor" Version="6.9.4" />
+    <PackageReference Include="BCrypt.Net-Next" Version="4.0.3" />
   </ItemGroup>
 
 </Project>