feat: topbar legacy-sync button, card view mode with cover fallback, year/month/day archives, richer page cache admin, stylevar repeater editor

- topbar: Livewire LegacySyncButton next to 写文章 (moved from user menu)
- view modes: add 图文(card) grid with cover fallback chain (cover → attachment → first content image → placeholder); list mode now title-only compact
- archives: year/month/day index grid
- page cache admin: size + expiry columns, total size, cache policy note
- theme inject: stylevars switch from KeyValue to Repeater with multi-line HTML editing
- import: html_entity_decode for category/post-title/link/keywords/comment author

app/Blog/Controllers/ArchiveController.php

@@ -14,8 +14,14 @@ class ArchiveController extends Controller
     {
         $posts = Post::published()->orderByDesc('published_at')->get(['id', 'title', 'slug', 'published_at']);
 
-        $archives = $posts->groupBy(fn (Post $post) => $post->published_at->format('Y'))
-            ->map(fn ($yearPosts) => $yearPosts->groupBy(fn (Post $post) => $post->published_at->format('m')));
+        // 年 → 月(1-12) → 日 → 文章，用于按年/月/日索引
+        $archives = [];
+        foreach ($posts as $post) {
+            $year = $post->published_at->format('Y');
+            $month = (int) $post->published_at->format('m');
+            $day = (int) $post->published_at->format('d');
+            $archives[$year][$month][$day][] = $post;
+        }
 
         return theme_view('archives', compact('archives'));
     }