refactor: remove '_infrastructure' suffix from infrastructure module files

- Rename apply_infrastructure.rs to apply.rs
- Rename initialize_infrastructure.rs to initialize.rs
- Rename plan_infrastructure.rs to plan.rs
- Update module declarations in infrastructure/mod.rs

Since these files are inside the infrastructure module, the '_infrastructure' suffix is redundant.

Author: josecelano

docs/e2e-tests-refactoring-plan.md

@@ -160,16 +160,16 @@ src/
 // Level 1: Commands and their constituent Level 2: Steps
 
 ProvisionCommand:
-├── ✅ RenderOpenTofuTemplatesStep   // Template rendering - COMPLETED & INTEGRATED INTO E2E TESTS
-├── ✅ InitializeInfrastructureStep  // tofu init - COMPLETED & INTEGRATED INTO E2E TESTS
-├── ✅ PlanInfrastructureStep        // tofu plan - COMPLETED & INTEGRATED INTO E2E TESTS
-├── ✅ ApplyInfrastructureStep       // tofu apply - COMPLETED & INTEGRATED INTO E2E TESTS
+├── ✅ RenderOpenTofuTemplatesStep   // Template rendering - COMPLETED
+├── ✅ InitializeInfrastructureStep  // tofu init - COMPLETED
+├── ✅ PlanInfrastructureStep        // tofu plan - COMPLETED
+├── ✅ ApplyInfrastructureStep       // tofu apply - COMPLETED
 ├── GetInstanceInfoStep              // Extract IP from tofu outputs
 ├── WaitForSSHConnectivityStep       // Validate SSH access
 └── WaitForCloudInitStep             // Wait for cloud-init completion
 
 ConfigureCommand:
-├── ✅ RenderAnsibleTemplatesStep    // Template rendering with runtime vars - COMPLETED & INTEGRATED INTO E2E TESTS
+├── ✅ RenderAnsibleTemplatesStep    // Template rendering with runtime vars - COMPLETED
 ├── InstallDockerStep                // Docker installation via Ansible
 ├── InstallDockerComposeStep         // Docker Compose installation via Ansible
 └── ValidateRemoteServicesStep       // Validate installations

…s/infrastructure/apply_infrastructure.rs src/steps/infrastructure/apply.rssrc/steps/infrastructure/apply_infrastructure.rs renamed to src/steps/infrastructure/apply.rs src/steps/infrastructure/apply_infrastructure.rs renamed to src/steps/infrastructure/apply.rs

@@ -1,7 +1,7 @@
-pub mod apply_infrastructure;
-pub mod initialize_infrastructure;
-pub mod plan_infrastructure;
+pub mod apply;
+pub mod initialize;
+pub mod plan;
 
-pub use apply_infrastructure::ApplyInfrastructureStep;
-pub use initialize_infrastructure::InitializeInfrastructureStep;
-pub use plan_infrastructure::PlanInfrastructureStep;
+pub use apply::ApplyInfrastructureStep;
+pub use initialize::InitializeInfrastructureStep;
+pub use plan::PlanInfrastructureStep;