Refactor API clients to use primary constructor for HttpClient

Refactored CatalogApiClient, DashboardApiClient, LayoutApiClient, and MassDataApiClient to use C# primary constructor syntax for injecting HttpClient. Removed private _httpClient fields and updated all usages to reference the constructor parameter directly. This change simplifies the code and modernizes dependency injection without altering any API logic.

DbFirst.BlazorWebApp/Services/MassDataApiClient.cs

@@ -4,19 +4,13 @@ using Microsoft.AspNetCore.WebUtilities;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class MassDataApiClient : IMassDataApiClient
+public class MassDataApiClient(HttpClient httpClient) : IMassDataApiClient
 {
-    private readonly HttpClient _httpClient;
     private const string Endpoint = "api/massdata";
 
-    public MassDataApiClient(HttpClient httpClient)
-    {
-        _httpClient = httpClient;
-    }
-
     public async Task<int> GetCountAsync(CancellationToken ct = default)
     {
-        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count", ct);
+        var result = await httpClient.GetFromJsonAsync<int?>("api/massdata/count", ct);
         return result ?? 0;
     }
 
@@ -27,13 +21,13 @@ public class MassDataApiClient : IMassDataApiClient
         if (take.HasValue) query["take"] = take.Value.ToString();
 
         var url = QueryHelpers.AddQueryString(Endpoint, query);
-        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url, ct);
+        var result = await httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url, ct);
         return result ?? [];
     }
 
     public async Task<ApiResult<MassDataReadDto?>> UpsertAsync(MassDataWriteDto dto, CancellationToken ct = default)
     {
-        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto, ct);
+        var response = await httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto, ct);
         if (response.IsSuccessStatusCode)
         {
             var payload = await response.Content.ReadFromJsonAsync<MassDataReadDto>();
@@ -51,7 +45,7 @@ public class MassDataApiClient : IMassDataApiClient
             return null;
         }
 
-        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}", ct);
+        var response = await httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}", ct);
         if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
         {
             return null;