refactor(vip): simplify user center membership summary

Remove profile identity chrome from the VIP header, keep the crown watermark, and flatten the summary into one thin card while preserving membership purchase cards.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/css/routes/user-center.css

@@ -1,5 +1,6 @@
 @import url("user-center/shell.css");
 @import url("user-center/credits.css");
+@import url("user-center/vip.css");
 @import url("user-center/level.css");
 @import url("user-center/settings.css");
 @import url("revenue.css");