Framework-level pagination with view and JSON helpers

[eaguad1337]

Problem

Pagination currently lives only in the ORM. There is no request-aware paginator at the framework level and no standard JSON shape or view presentation for paginated results.

Proposal

Framework-level paginators that build on the ORM's .paginate():

• A simple paginator and a length-aware paginator.
• Read page / per_page from the current request automatically.
• Expose links and meta (current page, last page, total, per page).
• Serialize to a consistent JSON envelope (data / meta / links).
• Render through reusable view partials / helpers for server-rendered pages.

Scope

Paginator classes, request integration, JSON contract, view partials/helpers.

Definition of Done

• Implementation with a documented JSON contract.
• pytest covers pagination math, request parsing, and JSON shape (suite green).
• Docs page + nav entry.
• Release notes entry.