Fix archive missing on manual publish; refresh VK token instructions

- Mark scheduled post as 'published' instead of deleting it when user clicks "Опубликовать сейчас", so it appears in the archive (parity with cron path)
- Surface VK warnings (e.g. photos posted as links when community token lacks photos right) in both the post-publish notification and the archive card
- Replace dead vkhost.github.io / VK Admin instructions with a community-token flow via group settings, since VK now blocks the old app (error 8)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

api.php

@@ -776,6 +776,43 @@ try {
             }
             break;
 
+        case 'mark_post_published':
+            $scheduledFile = __DIR__ . '/data/scheduled_posts.json';
+            $postId = $_POST['id'] ?? '';
+            $resultsJson = $_POST['results'] ?? '{}';
+            $results = json_decode($resultsJson, true) ?: [];
+
+            if (!$postId) {
+                echo json_encode(['error' => 'ID поста не указан']);
+                exit;
+            }
+
+            $posts = file_exists($scheduledFile) ? json_decode(file_get_contents($scheduledFile), true) ?: [] : [];
+            $found = false;
+
+            foreach ($posts as &$post) {
+                if (($post['id'] ?? null) === $postId && ($post['status'] ?? '') === 'pending') {
+                    $post['status'] = 'published';
+                    $post['published_at'] = date('Y-m-d H:i:s');
+                    $post['results'] = $results;
+                    $found = true;
+                    break;
+                }
+            }
+            unset($post);
+
+            if (!$found) {
+                echo json_encode(['error' => 'Пост не найден или уже опубликован']);
+                exit;
+            }
+
+            if (file_put_contents($scheduledFile, json_encode($posts, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE))) {
+                echo json_encode(['success' => true]);
+            } else {
+                echo json_encode(['error' => 'Не удалось сохранить']);
+            }
+            break;
+
         case 'get_published_posts':
             $scheduledFile = __DIR__ . '/data/scheduled_posts.json';
             if (file_exists($scheduledFile)) {