refactor: Phase 7-2 - Inquiry page API-First (partial)

**Implementation:**
- InquiryBrowserClient: HTTP API client interface
  * GetPagedAsync(page, pageSize): Fetch inquiries
  * GetByIdAsync(id): Fetch single inquiry
  * UpdateStatusAsync(id, status): Change status

- Program.cs: Register InquiryBrowserClient
  * AddHttpClient with TokenRefreshHandler

- InquiryTable.razor: Refactored
  * Before: @inject InquiryService (direct service call)
  * After: @inject IInquiryBrowserClient (API call)
  * Status labels: Use InquiryStatusMapper
  * API calls via client instead of service

**Status:**
- Blog page: ✅ Already API-First (ApiClient)
- Inquiry table: ✅ API-First (IInquiryBrowserClient)
- Inquiry detail: ⏳ Pending (needs additional API endpoints)
  * UpdateAdminMemoAsync
  * LinkClientAsync
  * ConvertToClientAsync

**SOLID Applied:**
✓ S (Single Responsibility): InquiryBrowserClient handles only Inquiry API calls
✓ D (Dependency Inversion): Blazor depends on IInquiryBrowserClient abstraction
✓ O (Open/Closed): Client can be extended without Blazor changes

Next: Implement remaining API endpoints for InquiryDetail refactoring

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TaxBaik.Web/Components/Admin/InquiryTable.razor

@@ -1,5 +1,5 @@
-@using TaxBaik.Application.Services
-@inject InquiryService InquiryService
+@using TaxBaik.Web.Services
+@inject IInquiryBrowserClient InquiryClient
 
 <MudSimpleTable Striped="true" Dense="true" Class="admin-table mt-4">
     <thead>
@@ -45,7 +45,7 @@
 
     protected override async Task OnInitializedAsync()
     {
-        var (items, _) = await InquiryService.GetPagedAsync(1, 100);
+        var (items, _) = await InquiryClient.GetPagedAsync(1, 100);
         inquiries = items.ToList();
         FilterInquiries();
     }
@@ -69,18 +69,14 @@
     private static Color GetStatusColor(string status) => status switch
     {
         "new" => Color.Warning,
-        "contacted" => Color.Info,
-        "completed" => Color.Success,
+        "consulting" => Color.Info,
+        "contracted" => Color.Success,
+        "rejected" => Color.Error,
+        "closed" => Color.Dark,
         _ => Color.Default
     };
 
-    private static string GetStatusLabel(string status) => status switch
-    {
-        "new" => "신규",
-        "contacted" => "연락함",
-        "completed" => "완료",
-        _ => status
-    };
+    private static string GetStatusLabel(string status) => InquiryStatusMapper.Labels.GetValueOrDefault(status, status);
 
     protected override async Task OnParametersSetAsync()
     {

TaxBaik.Web/Program.cs

@@ -75,6 +75,8 @@ builder.Services.AddHttpClient<IAdminDashboardClient, AdminDashboardClient>(clie
     client.BaseAddress = new Uri("http://localhost:5001/taxbaik/api/");
 })
     .AddHttpMessageHandler<TokenRefreshHandler>();
+builder.Services.AddHttpClient<IInquiryBrowserClient, InquiryBrowserClient>()
+    .AddHttpMessageHandler<TokenRefreshHandler>();
 
 // UI & 캐시
 builder.Services.AddMudServices();

TaxBaik.Web/Services/InquiryBrowserClient.cs

@@ -0,0 +1,90 @@
+namespace TaxBaik.Web.Services;
+
+using System.Net.Http.Json;
+using TaxBaik.Domain.Entities;
+
+/// <summary>
+/// Inquiry API Client for Admin Blazor
+/// SOLID: Single Responsibility - Inquiry API calls only
+/// Dependency Inversion - abstraction via interface
+/// </summary>
+public interface IInquiryBrowserClient
+{
+    Task<(IEnumerable<Inquiry> Items, int Total)> GetPagedAsync(int page = 1, int pageSize = 20, CancellationToken ct = default);
+    Task<Inquiry?> GetByIdAsync(int id, CancellationToken ct = default);
+    Task<bool> UpdateStatusAsync(int id, string status, CancellationToken ct = default);
+}
+
+public class InquiryBrowserClient : IInquiryBrowserClient
+{
+    private readonly HttpClient _http;
+    private readonly ILogger<InquiryBrowserClient> _logger;
+
+    public InquiryBrowserClient(HttpClient http, ILogger<InquiryBrowserClient> logger)
+    {
+        _http = http;
+        _logger = logger;
+    }
+
+    public async Task<(IEnumerable<Inquiry> Items, int Total)> GetPagedAsync(
+        int page = 1, int pageSize = 20, CancellationToken ct = default)
+    {
+        try
+        {
+            var result = await _http.GetFromJsonAsync<InquiryPagedResponse>(
+                $"http://localhost:5001/taxbaik/api/inquiry?page={page}&pageSize={pageSize}",
+                cancellationToken: ct);
+
+            return result != null
+                ? (result.Data, result.Total)
+                : ([], 0);
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "Failed to fetch inquiries");
+            throw;
+        }
+    }
+
+    public async Task<Inquiry?> GetByIdAsync(int id, CancellationToken ct = default)
+    {
+        try
+        {
+            return await _http.GetFromJsonAsync<Inquiry>(
+                $"http://localhost:5001/taxbaik/api/inquiry/{id}",
+                cancellationToken: ct);
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "Failed to fetch inquiry {InquiryId}", id);
+            throw;
+        }
+    }
+
+    public async Task<bool> UpdateStatusAsync(int id, string status, CancellationToken ct = default)
+    {
+        try
+        {
+            var request = new { status };
+            var response = await _http.PutAsJsonAsync(
+                $"http://localhost:5001/taxbaik/api/inquiry/{id}/status",
+                request,
+                cancellationToken: ct);
+
+            return response.IsSuccessStatusCode;
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "Failed to update inquiry {InquiryId} status", id);
+            throw;
+        }
+    }
+
+    private class InquiryPagedResponse
+    {
+        public List<Inquiry> Data { get; set; } = [];
+        public int Total { get; set; }
+        public int Page { get; set; }
+        public int PageSize { get; set; }
+    }
+}