Add NFC chore submission feature and enhance family settings

- Introduced NFC support for chore submissions, allowing specific person credit after Head of Household approval.
- Updated family settings to include NFC base URL, scan cooldown, and confirmation page options.
- Enhanced chore management with options for anyone to complete chores and NFC link generation.
- Improved API endpoints for handling NFC tokens and chore submissions.
- Updated readme to reflect new NFC features and settings.

api/chore_nfc_toggle.php

@@ -0,0 +1,43 @@
+<?php
+
+require_once __DIR__ . '/../includes/api_bootstrap.php';
+require_once __DIR__ . '/../includes/chore_helpers.php';
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    sendJson(['success' => false, 'error' => 'Method not allowed'], 405);
+}
+
+$people = migrateAllPeople(normalizePeopleList(readJsonFile('people.json')));
+$actor = requireActivePerson($people);
+if (($actor['role'] ?? '') !== ROLE_HEAD || !isHohVerified()) {
+    sendJson(['success' => false, 'error' => 'Only a verified Head of household can manage NFC'], 403);
+}
+
+$body = readJsonBody();
+$id = isset($body['id']) ? trim((string) $body['id']) : '';
+$enabled = !empty($body['enabled']);
+if ($id === '') {
+    sendJson(['success' => false, 'error' => 'id is required'], 400);
+}
+
+$rawChores = normalizeChoresList(readJsonFile('chores.json'));
+$chores = migrateAllChores($rawChores, $people);
+$idx = findChoreIndexById($chores, $id);
+if ($idx === null) {
+    sendJson(['success' => false, 'error' => 'Chore not found'], 404);
+}
+
+$chore = $chores[$idx];
+$nfcMeta = normalizeChoreNfcMeta($chore['nfc'] ?? null);
+if ((string) ($nfcMeta['token_hash'] ?? '') === '' && $enabled) {
+    sendJson(['success' => false, 'error' => 'Generate an NFC token first'], 400);
+}
+$nfcMeta['enabled'] = $enabled;
+$chore['nfc'] = $nfcMeta;
+$chores[$idx] = migrateLegacyChoreRow($chore, $people);
+
+if (!writeJsonFile('chores.json', $chores)) {
+    sendJson(['success' => false, 'error' => 'Failed to save chore'], 500);
+}
+
+sendJson(['success' => true, 'enabled' => $enabled, 'nfc' => $nfcMeta]);