🧱refactor: remove Blazor front-end & reposition API as the core product

Strategic refactor to address technical debt and scope deviation.

Motivation (Why):
- Improved maintainability with full focus on the .NET API ecosystem
  (C#, ASP.NET Core, EF Core, SQL Server, Redis).
- The project previously maintained a monolithic coupling with an incomplete Blazor UI (Finance.Web),
  which did not meet the same quality standards as the back-end.
- A poorly functioning or visually weak front-end degrades the perceived value of a robust API.
  A bad UI anchors perception negatively: “a weak front-end stains a strong back-end”.
- The core identity of this project is back-end engineering. Maintaining a mediocre UI diverted focus
  from performance, security, and API architecture.
- A RESTful API must be client-agnostic. Removing the Blazor client enforces proper decoupling and
  elevates OpenAPI (Swagger) as the primary interface.

New Product Definition:
- From this commit onward, the API itself is the final product.
- Swagger UI becomes the main interaction surface for developers and reviewers,
  exposing endpoints, contracts, and data models transparently.

Technical Changes (How):
- Removed Finance.Web and Finance.Web.Tests from the solution.
- Deleted Blazor source folders from the filesystem.
- Refactored Dockerfile to remove unnecessary build stages tied to the front-end.
- Added .dockerignore to reduce Docker build context and image size.
- Updated CORS policy:
  - Removed hardcoded localhost origin tied to the former front-end.
  - Adopted a permissive development-focused policy to support Swagger, Postman,
    and future client integrations.

Impact:
- Breaking change: the application no longer serves HTML/Blazor pages.
- Significantly reduced build times.

Author: alysonsz

Finance.Api.Tests/FakeAuthenticationHandler.cs

@@ -14,7 +14,7 @@ protected override Task<AuthenticateResult> HandleAuthenticateAsync()
         var claims = new[]
         {
             new Claim(ClaimTypes.NameIdentifier, "1"),
-            new Claim("email", "teste@email.com")
+            new Claim("email", "teste@user.com")
         };
         var identity = new ClaimsIdentity(claims, AuthenticationScheme);
         var principal = new ClaimsPrincipal(identity);

Finance.Api/Extensions/BuilderExtension.cs

@@ -25,7 +25,13 @@ public static void AddConfiguration(this WebApplicationBuilder builder)
     public static void AddDatabase(this WebApplicationBuilder builder)
     {
         builder.Services.AddDbContext<FinanceDbContext>(o =>
-            o.UseSqlServer(ApiConfiguration.ConnectionString));
+            o.UseSqlServer(ApiConfiguration.ConnectionString, sqlOptions =>
+            {
+                sqlOptions.EnableRetryOnFailure(
+                    maxRetryCount: 5,
+                    maxRetryDelay: TimeSpan.FromSeconds(10),
+                    errorNumbersToAdd: null);
+            }));
     }
 
     public static void AddCors(this WebApplicationBuilder builder)
@@ -34,7 +40,7 @@ public static void AddCors(this WebApplicationBuilder builder)
         options => options.AddPolicy(
                 ApiConfiguration.CorsPolicyName,
                 policy => policy
-                    .WithOrigins("https://localhost:7243")
+                    .SetIsOriginAllowed(origin => true)
                     .AllowAnyMethod()
                     .AllowAnyHeader()
                     .AllowCredentials()