feat(admin): restore Blazor WebAssembly architecture for admin pages with hybrid Server routing

TaxBaik.Web.Client/Services/AdminClients/ICommonCodeBrowserClient.cs

@@ -0,0 +1,56 @@
+namespace TaxBaik.Web.Services.AdminClients;
+
+using System.Collections.Generic;
+using System.Net.Http.Json;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using TaxBaik.Domain.Entities;
+using Microsoft.Extensions.Logging;
+
+public interface ICommonCodeBrowserClient
+{
+    Task<List<CommonCode>> GetAllActiveAsync(CancellationToken ct = default);
+    Task<List<CommonCode>> GetByGroupAsync(string group, CancellationToken ct = default);
+}
+
+public class CommonCodeBrowserClient(HttpClient httpClient, ITokenStore tokenStore, ILogger<CommonCodeBrowserClient> logger) : ICommonCodeBrowserClient
+{
+    private const string BaseUrl = "/api/commoncode";
+
+    private void EnsureAuthHeader()
+    {
+        if (!string.IsNullOrEmpty(tokenStore.AccessToken))
+            httpClient.DefaultRequestHeaders.Authorization = new("Bearer", tokenStore.AccessToken);
+        else
+            httpClient.DefaultRequestHeaders.Authorization = null;
+    }
+
+    public async Task<List<CommonCode>> GetAllActiveAsync(CancellationToken ct = default)
+    {
+        try
+        {
+            EnsureAuthHeader();
+            return await httpClient.GetFromJsonAsync<List<CommonCode>>($"{BaseUrl}", ct) ?? [];
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Failed to get all active common codes");
+            return [];
+        }
+    }
+
+    public async Task<List<CommonCode>> GetByGroupAsync(string group, CancellationToken ct = default)
+    {
+        try
+        {
+            EnsureAuthHeader();
+            return await httpClient.GetFromJsonAsync<List<CommonCode>>($"{BaseUrl}/group/{group}", ct) ?? [];
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Failed to get common codes for group {Group}", group);
+            return [];
+        }
+    }
+}