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/components/home/WorkspaceNav.tsx

@@ -2,7 +2,7 @@
 
 import Link from "next/link";
 import { useSearchParams } from "next/navigation";
-import { PenSquare, Home } from "lucide-react";
+import { PenSquare, Home, LayoutGrid } from "lucide-react";
 import type { BoardWithCount, User } from "@/lib/api";
 
 // 首页壳内板块切换：仅替换中栏帖子流，不离开工作台
@@ -10,7 +10,7 @@ function boardHref(id: number) {
   return `/?board=${id}`;
 }
 
-// 桌面左栏：板块导航
+// 桌面左栏：整块模块，与右栏 j13-module 对齐
 export function WorkspaceNav({ boards }: { boards: BoardWithCount[]; user?: User | null }) {
   const params = useSearchParams();
   const activeBoard = Number(params.get("board")) || 0;
@@ -18,57 +18,57 @@ export function WorkspaceNav({ boards }: { boards: BoardWithCount[]; user?: User
   return (
     // sticky 必须挂在 flex 子项上：父级 items-start 会把内层缩成内容高，失去粘滞行程
     <nav
-      className="hidden lg:block w-56 xl:w-60 shrink-0 sticky top-[var(--rail-top)] max-h-[var(--rail-max-h)] j13-rail-scroll"
+      className="hidden lg:block w-56 xl:w-60 shrink-0 sticky top-[var(--rail-top)] max-h-[var(--rail-max-h)]"
       aria-label="工作台导航"
     >
-      <div className="space-y-5">
-        {/* 「全部讨论」是重置筛选的动作入口，与板块目录分区展示；卡片样式与下方板块一致 */}
-        <div className="space-y-0.5">
-          <Link href="/" className="j13-bcard" aria-current={activeBoard === 0 ? "page" : undefined}>
+      <section className="j13-module flex max-h-[var(--rail-max-h)] flex-col overflow-hidden">
+        <p className="j13-module-title shrink-0">
+          <LayoutGrid size={15} style={{ color: "var(--accent)" }} aria-hidden />
+          板块目录
+          {boards.length > 0 ? (
+            <span className="ml-auto meta text-[11.5px] font-medium tracking-normal tabular-nums">
+              {boards.length} 个
+            </span>
+          ) : null}
+        </p>
+
+        <div className="j13-rail-scroll j13-board-list mt-2.5 min-h-0 flex-1">
+          <Link
+            href="/"
+            className="j13-bcard"
+            aria-current={activeBoard === 0 ? "page" : undefined}
+          >
             <span
               className="j13-bcard-ico"
               style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
               aria-hidden="true"
             >
-              <Home size={16} />
-            </span>
-            <span className="j13-bcard-name flex-1 truncate text-[14px]">
-              全部讨论
+              <Home size={15} />
             </span>
+            <span className="j13-bcard-name flex-1 truncate">全部讨论</span>
           </Link>
-        </div>
 
-        {/* 板块目录：纯分区标题；下方卡片仅在中栏筛选该板帖子流 */}
-        <div>
-          <div className="px-1 mb-2 flex items-center justify-between text-[11.5px] font-medium tracking-[0.08em] uppercase text-[var(--ink-3)]">
-            <span>板块目录</span>
-            {boards.length > 0 && (
-              <span className="tracking-normal tabular-nums">{boards.length} 个</span>
-            )}
-          </div>
-          <div className="space-y-2">
-            {boards.map((b, i) => (
-              <Link
-                key={b.id}
-                href={boardHref(b.id)}
-                className="j13-bcard"
-                aria-current={activeBoard === b.id ? "page" : undefined}
-                aria-label={`${b.name}板块，${b.post_count} 篇讨论`}
-              >
-                <span className={`av-${i % 8} j13-bcard-ico`} aria-hidden="true">
-                  {b.name.slice(0, 1)}
-                </span>
-                <span className="min-w-0 flex-1 flex items-center justify-between gap-2">
-                  <span className="j13-bcard-name truncate text-[14px]">
-                    {b.name}
-                  </span>
-                  <span className="meta shrink-0 text-[11px] tabular-nums">{b.post_count} 篇</span>
-                </span>
-              </Link>
-            ))}
-          </div>
+          {boards.length > 0 ? <div className="j13-board-split" role="separator" /> : null}
+
+          {boards.map((b, i) => (
+            <Link
+              key={b.id}
+              href={boardHref(b.id)}
+              className="j13-bcard"
+              aria-current={activeBoard === b.id ? "page" : undefined}
+              aria-label={`${b.name}板块，${b.post_count} 篇讨论`}
+            >
+              <span className={`av-${i % 8} j13-bcard-ico`} aria-hidden="true">
+                {b.name.slice(0, 1)}
+              </span>
+              <span className="min-w-0 flex-1 flex items-center justify-between gap-2">
+                <span className="j13-bcard-name truncate">{b.name}</span>
+                <span className="meta shrink-0 text-[11px] tabular-nums">{b.post_count} 篇</span>
+              </span>
+            </Link>
+          ))}
         </div>
-      </div>
+      </section>
     </nav>
   );
 }