feat: 后台全中文（Filament zh_CN 语言包+资源中文label）+ 插件独立导航分组 + 插件/主题管理卡片化 + 主题预览图（无头浏览器生成）+ 两套主题移动端适配

themes/modern/assets/style.css

@@ -141,3 +141,20 @@ a:hover { opacity: 0.8; }
 .plans-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
 .plan-card .plan-price { font-size: 26px; font-weight: 800; color: var(--accent); }
 .paid-teaser { background: rgba(248,81,73,.08); border: 1px dashed var(--accent); border-radius: 8px; padding: 12px 16px; color: var(--muted); font-size: 14px; margin: 12px 0; }
+
+/* ============ 移动端适配 ============ */
+@media (max-width: 768px) {
+    .m-header .m-container { flex-direction: column; align-items: flex-start; gap: 12px; padding: 16px 20px; }
+    .m-nav { flex-wrap: wrap; gap: 12px; width: 100%; }
+    .m-search { flex: 1; min-width: 100%; }
+    .m-search input { width: 100%; }
+    .main-layout { flex-direction: column; padding: 24px 16px; }
+    .main-layout .content { max-width: 100%; }
+    .main-layout .sidebar { width: 100%; }
+    .post-card, .post-full, .comments-section { padding: 20px; }
+    .post-cover { margin: -20px -20px 16px; }
+    .post-full .post-title { font-size: 24px; }
+    .auth-box { padding: 24px 20px; }
+    .pagination-links { gap: 6px; }
+    .pagination-links a, .pagination-links .current, .pagination-links .disabled { padding: 5px 10px; }
+}