feat(labrinth): basic offset pagination for moderation reports and projects

[AlexTMjugador]

Overview

These changes add basic pagination capabilities to the Labrinth routes for fetching moderation reports and projects pending review, using standard LIMIT and OFFSET SQL clauses.

Although these clauses can become inefficient when doing deep pagination (and at the moment the reports fetching route takes ~400 ms to complete), the current primary bottleneck when rendering the related moderation pages is the need to fetch a large amount of project data for each report, very significantly contributing to the several seconds it can take for the page to load. In this context, even a somewhat slow paginated route is an improvement, as it helps the frontend distribute the load of high-volume data queries around.

Additionally, I added an index to the reports table to enable more efficient filtering by report status, which should help reduce the cost of sequential database scans.