Redesign landing page and add Caddy deployment for nomadro.com

Co-authored-by: Cursor <cursoragent@cursor.com>

components/sections/content-preview.tsx

@@ -9,7 +9,7 @@ const TAG_COLORS: Record<string, string> = {
   城市: "bg-blue-50 text-blue-700",
   专题: "bg-emerald-50 text-emerald-700",
   工具: "bg-amber-50 text-amber-700",
-  活动: "bg-rose-50 text-rose-700",
+  直播: "bg-rose-500/15 text-rose-300 ring-1 ring-rose-400/20",
   学习路径: "bg-violet-50 text-violet-700",
   会员: "bg-neutral-100 text-neutral-700",
 };