API resources and response transformers

[eaguad1337]

Problem

Turning models into JSON for APIs is done ad-hoc in controllers. There is no reusable transformation layer, so output shape drifts across endpoints.

Proposal

API resource classes:

• A single-resource transformer mapping a model to a JSON structure.
• A resource collection wrapper.
• Conditional fields and relationship inclusion.
• Pagination-aware wrapping (works with the framework paginator, Add Redis queue driver #2) with a meta block.
• make:resource command + stub.

Scope

Resource + ResourceCollection classes, Response integration, paginator integration, command + stub.

Definition of Done

• Implementation.
• pytest covers single/collection transforms, conditional fields, and paginated wrapping (suite green).
• Docs page + nav entry.
• Release notes entry.

Depends on #2 (framework-level pagination) for paginated collections.