refactor: complete WebAssembly migration - proper architecture

Phase 8: Complete WebAssembly 렌더 모드 전환 (정공법)

Migration Summary:
- ALL Admin components → TaxBaik.Web.Client
- Routes.razor, Pages/*, Layout/*, Shared/*, Forms/*
- App.razor → TaxBaik.WasmClient (호스트 컴포넌트)
- Shared utilities → TaxBaik.Application.Utils

Architecture:
✅ App.razor: TaxBaik.WasmClient (WebAssembly, 호스트)
✅ Routes + Pages: TaxBaik.WasmClient (WebAssembly)
✅ Layout + Shared + Forms: TaxBaik.WasmClient (WebAssembly)
✅ Services: TaxBaik.Web (API-First)

Key Changes:
- Namespaces: TaxBaik.Web.Components.Admin → TaxBaik.WasmClient.Components.Admin
- Shared utilities: TaxBaik.Application.Utils (single source of truth)
- Program.cs: MapRazorComponents<TaxBaik.WasmClient.Components.Admin.App>()
- _Imports.razor: Components/Admin 폴더에 재구성

Build Status: ✅ 0 errors, 0 warnings

Benefits:
- Stateless server (no Circuit memory)
- Client-side rendering (WebAssembly)
- Unlimited concurrent users (horizontal scaling)
- ERP-ready architecture

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

TaxBaik.Web.Client/Components/Admin/Pages/Inquiries/InquiryList.razor

@@ -0,0 +1,74 @@
+@page "/admin/inquiries"
+@attribute [Authorize]
+@using TaxBaik.Web.Services
+@inject IInquiryBrowserClient InquiryClient
+
+<PageTitle>문의 관리</PageTitle>
+
+<AdminPageHeader Title="문의 관리" Eyebrow="Customer Requests" Subtitle="상담 요청을 상태별로 확인하고 후속 조치를 기록합니다.">
+    <ChildContent>
+        <MudButton Variant="Variant.Filled" Color="Color.Primary" StartIcon="@Icons.Material.Filled.Add"
+                   Href="/taxbaik/admin/inquiries/create">새 문의 등록</MudButton>
+    </ChildContent>
+</AdminPageHeader>
+
+<AdminDataPanel Loading="@isLoading">
+    <MudTabs Rounded="true" Elevation="0" Class="admin-tabs">
+        <MudTabPanel Text="전체">
+            <InquiryTable Inquiries="allInquiries" Status="" />
+        </MudTabPanel>
+        <MudTabPanel Text="신규">
+            <InquiryTable Inquiries="allInquiries" Status="new" />
+        </MudTabPanel>
+        <MudTabPanel Text="상담중">
+            <InquiryTable Inquiries="allInquiries" Status="consulting" />
+        </MudTabPanel>
+        <MudTabPanel Text="계약완료">
+            <InquiryTable Inquiries="allInquiries" Status="contracted" />
+        </MudTabPanel>
+        <MudTabPanel Text="거절">
+            <InquiryTable Inquiries="allInquiries" Status="rejected" />
+        </MudTabPanel>
+        <MudTabPanel Text="종결">
+            <InquiryTable Inquiries="allInquiries" Status="closed" />
+        </MudTabPanel>
+    </MudTabs>
+</AdminDataPanel>
+
+@code {
+    [CascadingParameter]
+    private Task<AuthenticationState>? AuthStateTask { get; set; }
+
+    private bool isLoading = true;
+    private IReadOnlyList<Domain.Entities.Inquiry> allInquiries = [];
+
+    protected override async Task OnInitializedAsync()
+    {
+        if (AuthStateTask != null)
+        {
+            var authState = await AuthStateTask;
+            if (authState.User.Identity?.IsAuthenticated == true)
+            {
+                await LoadData();
+            }
+        }
+    }
+
+    private async Task LoadData()
+    {
+        isLoading = true;
+        try
+        {
+            var (items, _) = await InquiryClient.GetPagedAsync(1, 200);
+            allInquiries = items.ToList();
+        }
+        catch
+        {
+            allInquiries = [];
+        }
+        finally
+        {
+            isLoading = false;
+        }
+    }
+}