Admin: add section rename and delete actions

Let admins manage section names and ordering from the media sidebar without manual DB edits. Add safe section deletion in admin flow and remove the section storage folder after DB cascade cleanup.

admin.php

@@ -36,6 +36,27 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $message = 'Раздел создан';
         }
 
+        if ($action === 'update_section') {
+            $sectionId = (int)($_POST['section_id'] ?? 0);
+            $name = trim((string)($_POST['name'] ?? ''));
+            $sort = (int)($_POST['sort_order'] ?? 1000);
+            if ($sectionId < 1) throw new RuntimeException('Некорректный раздел');
+            if ($name === '') throw new RuntimeException('Название раздела пустое');
+            if (!sectionById($sectionId)) throw new RuntimeException('Раздел не найден');
+            sectionUpdate($sectionId, $name, $sort);
+            $message = 'Раздел обновлён';
+        }
+
+        if ($action === 'delete_section') {
+            $sectionId = (int)($_POST['section_id'] ?? 0);
+            if ($sectionId < 1) throw new RuntimeException('Некорректный раздел');
+            if (!sectionById($sectionId)) throw new RuntimeException('Раздел не найден');
+
+            sectionDelete($sectionId);
+            deleteSectionStorage($sectionId);
+            $message = 'Раздел удалён';
+        }
+
         if ($action === 'update_welcome') {
             $text = trim((string)($_POST['welcome_text'] ?? ''));
             settingSet('welcome_text', $text);
@@ -143,6 +164,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
 $sections = sectionsAll();
 $activeSectionId = (int)($_GET['section_id'] ?? ($_POST['section_id'] ?? ($sections[0]['id'] ?? 0)));
+$activeSection = $activeSectionId > 0 ? sectionById($activeSectionId) : null;
+if (!$activeSection && $sections !== []) {
+    $activeSectionId = (int)$sections[0]['id'];
+    $activeSection = sectionById($activeSectionId);
+}
 $photos = $activeSectionId > 0 ? photosBySection($activeSectionId) : [];
 $commenters = commentersAll();
 $latestComments = commentsLatest(80);
@@ -240,6 +266,40 @@ function uniqueName(string $dir, string $base, string $ext): string
     return $name;
 }
 
+function deleteSectionStorage(int $sectionId): void
+{
+    $dir = __DIR__ . '/photos/section_' . $sectionId;
+    if (!is_dir($dir)) {
+        return;
+    }
+
+    deleteDirRecursive($dir);
+}
+
+function deleteDirRecursive(string $dir): void
+{
+    $items = scandir($dir);
+    if (!is_array($items)) {
+        return;
+    }
+
+    foreach ($items as $item) {
+        if ($item === '.' || $item === '..') {
+            continue;
+        }
+
+        $path = $dir . '/' . $item;
+        if (is_dir($path)) {
+            deleteDirRecursive($path);
+            continue;
+        }
+
+        @unlink($path);
+    }
+
+    @rmdir($dir);
+}
+
 function nextSortOrderForSection(int $sectionId): int
 {
     $st = db()->prepare('SELECT COALESCE(MAX(sort_order),0)+10 FROM photos WHERE section_id=:sid');
@@ -295,6 +355,22 @@ function nextUniqueCodeName(string $base): string
             <a class="<?= (int)$s['id']===$activeSectionId?'active':'' ?>" href="?token=<?= urlencode($tokenIncoming) ?>&section_id=<?= (int)$s['id'] ?>"><?= h((string)$s['name']) ?> <span class="small">(<?= (int)$s['photos_count'] ?>)</span></a>
           <?php endforeach; ?>
         </div>
+
+        <?php if ($activeSection): ?>
+          <hr style="border:none;border-top:1px solid #eee;margin:12px 0">
+          <h4 style="margin:0 0 8px">Редактировать выбранный</h4>
+          <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=media&section_id=<?= (int)$activeSectionId ?>">
+            <input type="hidden" name="action" value="update_section"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="section_id" value="<?= (int)$activeSectionId ?>">
+            <p><input class="in" name="name" value="<?= h((string)$activeSection['name']) ?>" required></p>
+            <p><input class="in" type="number" name="sort_order" value="<?= (int)$activeSection['sort_order'] ?>"></p>
+            <button class="btn" type="submit">Переименовать</button>
+          </form>
+          <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=media" onsubmit="return confirm('Удалить раздел и все его фото?')" style="margin-top:8px">
+            <input type="hidden" name="action" value="delete_section"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="section_id" value="<?= (int)$activeSectionId ?>">
+            <button class="btn btn-danger" type="submit">Удалить раздел</button>
+          </form>
+        <?php endif; ?>
+
         <hr style="border:none;border-top:1px solid #eee;margin:12px 0">
         <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=media">
           <input type="hidden" name="action" value="create_section"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>">