Add backup and restore of data

static/app.js

@@ -48,4 +48,7 @@ ensureImageControls();
 $('#imageInput').addEventListener('change', () => { const files = [...$('#imageInput').files]; $('#imageName').textContent = files.length ? `${files.length} new picture${files.length === 1 ? '' : 's'} selected` : 'Up to 5 pictures'; });
 $('#itemForm').addEventListener('submit', async (event) => { event.preventDefault(); const formData = new FormData(event.target); if (!$('#imageInput').files.length) formData.delete('images'); try { await request(state.editingId ? `/api/items/${state.editingId}` : '/api/items', { method: state.editingId ? 'PUT' : 'POST', body: formData }); closeModal(); toast(state.editingId ? 'Item updated.' : 'Item added to inventory.'); await load(); } catch (error) { toast(error.message); } });
 $('#exportButton').addEventListener('click', () => { if (!state.items.length) return toast('There are no visible items to export.'); const columns = ['name','item_type','brand','model','serial_number','asset_tag','status','location','purchase_date','cpu','ram','gpu','storage','media_format','notes']; const csv = [columns.join(','), ...state.items.map((item) => columns.map((column) => `"${String(item[column] || '').replaceAll('"', '""')}"`).join(','))].join('\n'); const link = document.createElement('a'); link.href = URL.createObjectURL(new Blob([csv], { type: 'text/csv' })); link.download = 'stockroom-inventory.csv'; link.click(); URL.revokeObjectURL(link.href); });
+$('#backupButton').addEventListener('click', async () => { try { const response = await fetch('/api/backup'); if (!response.ok) throw new Error('Backup could not be created.'); const link = document.createElement('a'); link.href = URL.createObjectURL(await response.blob()); link.download = 'stockroom-backup.zip'; link.click(); URL.revokeObjectURL(link.href); toast('Backup downloaded.'); } catch (error) { toast(error.message); } });
+$('#restoreButton').addEventListener('click', () => $('#restoreInput').click());
+$('#restoreInput').addEventListener('change', async () => { const file = $('#restoreInput').files[0]; if (!file || !confirm('Restore this backup? Current inventory and pictures will be replaced.')) return; const formData = new FormData(); formData.append('backup', file); try { await request('/api/restore', { method: 'POST', body: formData }); toast('Backup restored. Reloading...'); setTimeout(() => window.location.reload(), 700); } catch (error) { toast(error.message); } $('#restoreInput').value = ''; });
 load().catch((error) => toast(error.message));