Add editable CAB changelogs and render them instead of static CAB entries. The commits_recent_activity presenter now fetches the most_recent vetted changelogs, preloads media, and includes before/after media while removing the image-only filter. It prepares editor/detail props and media URLs. The frontend renders a ChangelogDetail when initialAfterMediaId exists, or a ChangelogEditor otherwise, enabling actual editing from CAB and better media handling.

This change adds a new API reference page for Surveys (polls) under vendor/gems/customer_api/app/views/api_reference/_surveys.html.haml. The docs describe how to create surveys, manage questions, submit responses, and fetch results, including endpoints, parameters, and example payloads. By providing a dedicated, self-contained reference, it improves API discoverability and developer onboarding for surveying features and their integration points.