add photo placeholder, mirrored camera capture, configurable footer, and student .url zip export

server.js

@@ -62,6 +62,13 @@ app.get('/api/settings', requireAdmin, async (_, res) => {
   res.json(out);
 });
 
+app.get('/api/public-settings', async (_, res) => {
+  const keys = ['footer_left', 'footer_right'];
+  const out = {};
+  for (const k of keys) out[k] = await getSetting(k, '');
+  res.json(out);
+});
+
 app.put('/api/settings', requireAdmin, async (req, res) => {
   const { settings } = req.body;
   if (!settings || typeof settings !== 'object') return res.status(400).json({ error: 'settings required' });