feat: 交付官方 Docker 运行时，外观改背景图并下线自定义 CSS/JS

站点/后台分轨背景与用户列表排序一并落地；生产 CORS 改走 SITE_URL，健康检查带版本号。

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

frontend/lib/hideBlocks.ts

@@ -12,9 +12,13 @@ export type HideSegment =
       body: string;
     };
 
-const HIDE_KINDS = new Set<HideKind>(["login", "reply", "points", "password"]);
+const HIDE_KINDS = new Set<string>(["login", "reply", "points", "password"]);
 const HIDE_OPEN_RE = /^\[hide(?:\s+(.+))?\]$/i;
 
+function isHideKind(s: string): s is HideKind {
+  return HIDE_KINDS.has(s);
+}
+
 function isClose(line: string): boolean {
   return line.trim().toLowerCase() === "[/hide]";
 }
@@ -40,8 +44,8 @@ function parseOpen(trimmed: string): {
     kind = head.slice(0, eq);
     arg = head.slice(eq + 1);
   }
-  kind = kind.toLowerCase() as HideKind;
-  if (!HIDE_KINDS.has(kind)) return null;
+  kind = kind.toLowerCase();
+  if (!isHideKind(kind)) return null;
 
   let idx = 1;
   let points = 0;