refactor(login): resolve dependencies with Autofac

[luccas00]

Related issue

Closes #216

Problem

The login form manually instantiated the database context, repositories
and application services. It was also responsible for creating the main
form and supplying all of its dependencies.

This increased coupling between the presentation, application and
infrastructure layers, despite the project already using Autofac.

Solution

• Removed manual dependency creation from TelaLogin;
• Resolved TelaLogin through the Autofac container;
• Injected only the FuncionarioAppService required for authentication;
• Injected Func<TelaPrincipalForm> to defer creation of the main form;
• Registered TelaLogin and TelaPrincipalForm in Autofac;
• Delegated resolution of the main form and its dependencies to Autofac;
• Removed unnecessary creation of an additional login form.

Validation

• Application builds successfully;
• Administrative login was validated;
• The main form opens after authentication;
• Database operations continue working correctly.

Files changed

• TelaLogin.cs
• AutoFac.cs
• Program.cs

[luccas00]

#230