Add Blazor screenshot and update modular-crm docs

Add a new screenshot asset and update the modular-crm tutorial (part-03.md). Changes include:

- Add images/vscode-catalog-index-razor-blazor-webapp.png.
- Wrap the "Exposing Application Services as HTTP API Controllers" section in an MVC conditional block ({{if UI == "MVC"}} ... {{end}}).
- Update HttpClient proxy registrations to include ModularCrmContractsModule and keep CatalogContractsModule, with an inline comment noting the addition.
- Replace the Blazor WebApp placeholder line with an actual markdown image reference to the newly added screenshot.

These edits provide the actual Blazor screenshot in the docs and clarify HTTP client proxy registration for the tutorial.

docs/en/tutorials/modular-crm/part-03.md

@@ -355,6 +355,8 @@ public partial class ProductToProductDtoMapper : MapperBase<Product, ProductDto>
 
 ### Exposing Application Services as HTTP API Controllers
 
+{{if UI == "MVC"}}
+
 > This application doesn't need to expose any functionality as HTTP API, because all the module integration and communication will be done in the same process as a natural aspect of a monolith modular application. However, in this section, we will create HTTP APIs because;
 >
 > 1. We will use these HTTP API endpoints in development to create some example data.
@@ -362,6 +364,8 @@ public partial class ProductToProductDtoMapper : MapperBase<Product, ProductDto>
 >
 > So, follow the instructions in this section and expose the product application service as an HTTP API endpoint.
 
+{{end}}
+
 To create HTTP API endpoints for the catalog module, you have two options:
 
 * You can create a regular ASP.NET Core Controller class in the `ModularCrm.Catalog` project, inject `IProductAppService` and create wrapper methods for each public method of the product application service. You will do this later while you create the Ordering module. (Also, you can check the `SampleController` class under the **Samples** folder in the `ModularCrm.Catalog` project for an example)
@@ -400,7 +404,9 @@ public class ModularCrmClientModule : AbpModule
 {
     public override void ConfigureServices(ServiceConfigurationContext context)
     {
-        context.Services.AddHttpClientProxies(typeof(CatalogContractsModule).Assembly);
+        ...
+        context.Services.AddHttpClientProxies(typeof(ModularCrmContractsModule).Assembly);
+        context.Services.AddHttpClientProxies(typeof(CatalogContractsModule).Assembly); // NEW: ADD HttpClientProxies
     }
 }
 ````
@@ -503,7 +509,7 @@ Here, you simply use the `IProductAppService` to get a list of all products and
 {{else if UI == "BlazorWebApp"}}
 
 Open the `ModularCrm.Catalog` .NET solution in your IDE, and find the `Pages/Catalog/Index.razor` file under the `ModularCrm.Catalog.Blazor` project.
-> Blazor WebApp placeholder screenshot file: `images/vscode-catalog-index-razor-blazor-webapp.png`
+![vscode-catalog-index-razor-blazor-webapp](images/vscode-catalog-index-razor-blazor-webapp.png)
 
 Replace the `Index.razor` file with the following content: