Feature: Batch Link Management for Admins

[codeCraft-Ritik]

Issue :

Currently, the admin interface allows managing links and users one by one. If an admin needs to delete or ban 50 malicious links from a single spammer, they must do it individually, which is inefficient.
Improvement: Implement a checkbox-based batch action system in the Admin Links table.

File Path : server/handlers/links.handler.js

Code logic to add :

// Add to server/handlers/links.handler.js
async function batchRemove(req, res) {
  const { ids } = req.body; // Array of UUIDs
  if (!Array.isArray(ids) || ids.length === 0) {
    throw new CustomError("No links selected.");
  }
  
  await query.link.removeBatch({
    uuids: ids,
    ...(!req.user.admin && { user_id: req.user.id })
  });

  return res.status(200).send({ message: `${ids.length} links deleted.` });
}

Frontend : Update server/views/partials/admin/links/table.hbs to include a "Select All" checkbox in the thead and individual checkboxes in each tr