refactor(terraform): Reorganize Infrastructure into Reusable Modules

[carlagesa]

To improve maintainability and reduce code duplication, we should refactor our existing Terraform resources into a modular structure. This involves identifying logical groups of resources (e.g., networking, compute, database) and moving them into their own modules. This will make our infrastructure code cleaner, more reusable, and easier to manage as the project grows.

Acceptance Criteria:

• A modules/ directory is created at the root of the terraform configuration.
• At least one logical group of resources (e.g., networking) is moved into a separate module.
• The root Terraform configuration is updated to call the new module.
• The infrastructure can be successfully deployed using the new modular structure.