feat : DATA_PATH configurable, DataGit auto-commit, UpdateChecker branche (v1.4.0)

- DATA_PATH : chemin /data hors document root, configurable via .env
  (fallback sur BASE_PATH/data si absent)
- DataGit : auto-commit git sur toutes les écritures articles/livres
  (create, update, delete, meta, tags, fichiers, liens…) sauf autosave
- UpdateChecker : getBranch() / getLastChecked() / clearCache(),
  branche configurable via FOLIO_UPDATE_BRANCH (plus de main hardcodé)
- Admin dashboard : affiche la branche suivie, date du dernier contrôle,
  bouton Vérifier pour forcer le check sans attendre le TTL
- CLAUDE.md : architecture DATA_PATH et flux de déploiement documentés

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/admin.php

@@ -104,6 +104,8 @@ function adminStatusBadge(array $a, int $now): string
     $_deployedVer   = trim((string) @file_get_contents(BASE_PATH . '/public/version.txt'));
     $_deployedLabel = $_deployedVer !== '' ? $_deployedVer : '—';
     $_notices       = isset($_updateChecker) ? $_updateChecker->adminNotices() : [];
+    $_branch        = isset($_updateChecker) ? $_updateChecker->getBranch() : 'main';
+    $_lastChecked   = isset($_updateChecker) ? $_updateChecker->getLastChecked() : null;
     $_remoteLabel   = '—';
     foreach ($_notices as $_n) {
         if ($_n['type'] === 'info' && preg_match('/v([\d]+\.[\d]+\.[\d]+)/', $_n['message'], $_m)) {
@@ -122,7 +124,16 @@ function adminStatusBadge(array $a, int $now): string
                     </tr>
                     <tr>
                         <th class="text-muted fw-normal ps-0 pe-2 text-nowrap">Dernière version disponible</th>
-                        <td><?= htmlspecialchars($_remoteLabel) ?><?= $_remoteLabel !== '—' && $_remoteLabel !== $_deployedLabel ? ' <span class="badge bg-warning text-dark ms-1">Mise à jour disponible</span>' : '' ?></td>
+                        <td class="d-flex align-items-center gap-2 flex-wrap">
+                            <span><?= htmlspecialchars($_remoteLabel) ?><?= $_remoteLabel !== '—' && $_remoteLabel !== $_deployedLabel ? ' <span class="badge bg-warning text-dark ms-1">Mise à jour disponible</span>' : '' ?></span>
+                            <form method="POST" action="/?action=force_update_check" class="d-inline">
+                                <button type="submit" class="btn btn-outline-secondary btn-sm py-0">Vérifier</button>
+                            </form>
+                        </td>
+                    </tr>
+                    <tr>
+                        <th class="text-muted fw-normal ps-0 pe-2 text-nowrap">Branche suivie</th>
+                        <td><code><?= htmlspecialchars($_branch) ?></code><?= $_lastChecked !== null ? ' <span class="text-muted ms-2">· vérifié le ' . date('d/m/Y à H:i', $_lastChecked) . '</span>' : '' ?></td>
                     </tr>
                     <?php if (!empty($_notices)): ?>
                     <tr>

templates/import_image_step2.php

@@ -60,7 +60,7 @@ $preSource = $step2Meta['canonical'] ?? $step2Meta['source'] ?? $step2Url;
 <div class="mb-4">
     <p class="fw-semibold small mb-2">Aperçu de la page</p>
     <?php
-    $previewMtime = @filemtime(BASE_PATH . '/data/' . $step2Article['uuid'] . '/files/' . $step2Screenshot) ?: time();
+    $previewMtime = @filemtime(DATA_PATH . '/' . $step2Article['uuid'] . '/files/' . $step2Screenshot) ?: time();
     ?>
     <img src="/file?uuid=<?= rawurlencode($step2Article['uuid']) ?>&name=<?= rawurlencode($step2Screenshot) ?>&v=<?= $previewMtime ?>"
          class="img-fluid rounded shadow-sm d-block"