feat: 友链/书库/移动端导航/排行榜等多模块功能

新增模块：
- 友链（friendlink）后端处理 + 前端管理页与友链板
- 书库（library）：导入、章节、封面、阅读页、横竖版自适应 AdaptiveCoverSlot
- 顶栏导航（header_nav）配置与 MobileTabBar/MobileRailDrawers 移动端抽屉
- 排行榜 service 测试、站点页面测试、时间线发布（timeline_release）

其它改动：
- 后端 handlers/services 全量小幅调整
- 前端组件、库函数、URL/品牌/站点 URL 工具更新
- Lightbox 图片、MdEntries 条目卡、coverColor 派生色相等前端能力

frontend/app/post/[id]/page.tsx

@@ -16,7 +16,6 @@ import {
   fetchUserProfile,
   fetchSidebar,
   postDeleteTypeLabel,
-  type UserProfile,
   type PostListItem,
   type CommentsResponse,
   type SidebarPublicPayload,
@@ -39,6 +38,7 @@ import { publicMarkdownForSeo } from "@/lib/hideBlocks";
 import PostAttachments from "@/components/PostAttachments";
 import PostEditedMark from "@/components/PostEditedMark";
 import PostInteractPanels, { QuestionStatusCard } from "@/components/PostInteractPanels";
+import MobileRailDrawers from "@/components/MobileRailDrawers";
 import AcceptedAnswerCard from "@/components/AcceptedAnswerCard";
 import { canModerateBoard } from "@/lib/roles";
 import { IconComment, IconEye } from "@/components/Icons";
@@ -122,7 +122,7 @@ function RelatedPosts({
   const titleId = `${uid}-title`;
   return (
     <section
-      className="j13-module shrink-0 max-sm:-mx-4 max-sm:rounded-none max-sm:border-x-0 max-sm:shadow-none"
+      className="j13-module shrink-0"
       aria-labelledby={titleId}
     >
       <p className="j13-module-title mb-1.5" id={titleId}>
@@ -163,87 +163,9 @@ function RelatedPosts({
   );
 }
 
-/* 移动端 / 窄屏作者卡（xl 以下内联在正文与评论之间，替代左栏作者模块） */
-function AuthorCardStacked({
-  profile,
-  allowComments,
-  boardNames,
-  boardColors,
-  urlStyle,
-}: {
-  profile: UserProfile;
-  allowComments: boolean;
-  /** 板块 id → 名称/配色：板块管理员徽章展示「{板块名}板块管理员」并对齐板块色 */
-  boardNames?: Record<number, string>;
-  boardColors?: Record<number, number>;
-  urlStyle: UrlStyle;
-}) {
-  const u = profile.user;
-  const signature = (u.signature || "").trim();
-  const { post_count, comment_count, points, streak } = profile.stats;
-  return (
-    <div className="panel p-4 sm:p-6 max-sm:-mx-4 max-sm:rounded-none max-sm:border-x-0 max-sm:shadow-none">
-      <p
-        className="text-[11.5px] font-medium tracking-[0.08em] uppercase mb-3.5"
-        style={{ color: "var(--ink-3)" }}
-      >
-        关于作者
-      </p>
-      <div className="flex items-start gap-4 flex-wrap">
-        <Link href={userPath(urlStyle, u.id)} className="shrink-0" aria-label={u.nickname}>
-          <Avatar name={u.nickname || u.username} src={u.avatar || undefined} size={52} />
-        </Link>
-        <div className="min-w-0 flex-1">
-          <div className="flex items-center gap-2 flex-wrap">
-            <Link
-              href={userPath(urlStyle, u.id)}
-              className="font-semibold text-[15px] hover:text-[var(--accent)] transition-colors"
-              style={{ color: "var(--ink)" }}
-            >
-              {u.nickname}
-            </Link>
-            <LevelBadge level={u.level} />
-            {(u.badges ?? []).slice(0, 2).map((ub) => (
-              <BadgeChip key={ub.id} badge={ub.badge} />
-            ))}
-            {u.role !== "user" && (
-              <RoleBadge role={u.role} boardIds={u.board_ids} boardNames={boardNames} boardColors={boardColors} />
-            )}
-          </div>
-          <p className="meta mt-1 flex items-center gap-1.5 flex-wrap">
-            <span>@{u.username}</span>
-            <span aria-hidden>·</span>
-            <span>发帖 {post_count}</span>
-            {allowComments ? (
-              <>
-                <span aria-hidden>·</span>
-                <span>评论 {comment_count}</span>
-              </>
-            ) : null}
-            <span aria-hidden>·</span>
-            <span>积分 {points}</span>
-            {streak > 0 && (
-              <>
-                <span aria-hidden>·</span>
-                <span className="inline-flex items-center gap-0.5 font-medium" style={{ color: "var(--gold)" }}>
-                  <Flame size={11} /> 连签 {streak} 天
-                </span>
-              </>
-            )}
-          </p>
-          {signature ? (
-            <p className="mt-2 text-[13px] leading-relaxed line-clamp-2" style={{ color: "var(--ink-2)" }}>
-              {signature}
-            </p>
-          ) : null}
-        </div>
-        <Link href={userPath(urlStyle, u.id)} className="btn btn-line btn-sm shrink-0 self-center">
-          访问主页
-        </Link>
-      </div>
-    </div>
-  );
-}
+/* ============================================================
+   右栏模块（lg 起展示；移动端收进右抽屉）
+   ============================================================ */
 
 export default async function PostDetailPage({ params, searchParams }: PageProps) {
   const { id } = await params;
@@ -374,6 +296,29 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
         ? "lg:grid-cols-[224px_minmax(0,1fr)] xl:grid-cols-[240px_minmax(0,1fr)]"
         : "lg:grid-cols-[minmax(0,1fr)_280px] xl:grid-cols-[minmax(0,1fr)_300px]";
 
+  // 移动端抽屉内容（lg 以下）：左抽屉 = 左栏侧栏块，右抽屉 = 右栏侧栏块（含文章目录）+ 同板块热议；
+  // 桌面常驻 aside 与抽屉共用渲染函数，uid 区分同屏两份 DOM 的 aria-labelledby
+  const leftRailNode = hasLeftRail ? (
+    <SidebarRenderer blocks={sidebarLists.left} widgets={sidebar.widgets} props={sidebarProps} />
+  ) : null;
+  const hasTocBlock = sidebarLists.right.some((r) => r.key === "post_toc");
+  const renderRightRail = (uid: string) => (
+    <>
+      {hasRightRail ? (
+        <SidebarRenderer blocks={sidebarLists.right} widgets={sidebar.widgets} props={sidebarProps} />
+      ) : null}
+      {related.length > 0 ? (
+        <RelatedPosts
+          posts={related}
+          boardId={post.board_id}
+          uid={uid}
+          allowComments={allowComments}
+          urlStyle={urlStyle}
+        />
+      ) : null}
+    </>
+  );
+
   // 非公开帖（待审/未通过）仅作者本人与管理团队可看，顶部给出醒目状态
   const isPublished = post.status === "published";
   const postType = normalizePostType(post.post_type);
@@ -487,6 +432,26 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
   return (
     <>
       <JsonLd data={jsonLd} />
+      {/* 移动端：吸顶工具栏 + 左右抽屉（导航 / 目录），lg 起隐藏；两侧皆无内容时组件自身不渲染 */}
+      <MobileRailDrawers
+        center={
+          <>
+            <p className="truncate text-[13px] font-bold leading-tight" style={{ color: "var(--ink)" }}>
+              {post.title}
+            </p>
+            <p className="meta mt-0.5 text-[10.5px] leading-tight">约 {readingMinutes} 分钟读完</p>
+          </>
+        }
+        left={leftRailNode ? { label: "导航", content: leftRailNode } : undefined}
+        right={
+          hasRightRail || related.length > 0
+            ? {
+                label: hasTocBlock ? "目录" : "热议",
+                content: renderRightRail("related-drawer"),
+              }
+            : undefined
+        }
+      />
       {/* 三栏阅读布局：宽度与首页工作台一致——lg = 左224 + 正文 + 右280，xl = 左240 + 正文 + 右300；以下单栏
           侧栏两列均可被站长清空，网格随之退化为两栏/单栏 */}
       <div
@@ -500,7 +465,7 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
             className="hidden lg:flex w-56 xl:w-60 shrink-0 sticky top-[var(--rail-top)] flex-col gap-4 max-h-[var(--rail-max-h)] overflow-hidden"
             aria-label="帖子导航"
           >
-            <SidebarRenderer blocks={sidebarLists.left} widgets={sidebar.widgets} props={sidebarProps} />
+            {leftRailNode}
           </aside>
         )}
 
@@ -697,18 +662,7 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
               </div>
             </div>
 
-            {/* 窄屏作者卡（lg 起由左栏承载，避免重复展示） */}
-            {profile && (
-              <div className="lg:hidden mt-4">
-                <AuthorCardStacked
-                  profile={profile}
-                  allowComments={allowComments}
-                  boardNames={boardNames}
-                  boardColors={boardColors}
-                  urlStyle={urlStyle}
-                />
-              </div>
-            )}
+            {/* 窄屏作者卡已移除：作者信息随左栏配置收进移动端左抽屉 */}
 
             {/* 关评：前台仅提示不支持评论，不展示历史楼层；非公开帖不提及评论 */}
             {isPublished ? (
@@ -756,17 +710,6 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
                 </p>
               </section>
             ) : null}
-
-            {/* 窄屏相关讨论（lg 起由右栏承载） */}
-            <div className="lg:hidden mt-4">
-              <RelatedPosts
-                posts={related}
-                boardId={post.board_id}
-                uid="related-inline"
-                allowComments={allowComments}
-                urlStyle={urlStyle}
-              />
-            </div>
           </article>
         </div>
 
@@ -776,8 +719,7 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
             className="hidden lg:flex w-[280px] xl:w-[300px] shrink-0 sticky top-[var(--rail-top)] flex-col gap-4 max-h-[var(--rail-max-h)] overflow-hidden"
             aria-label="阅读辅助"
           >
-            <SidebarRenderer blocks={sidebarLists.right} widgets={sidebar.widgets} props={sidebarProps} />
-            <RelatedPosts posts={related} boardId={post.board_id} allowComments={allowComments} urlStyle={urlStyle} />
+            {renderRightRail("related")}
           </aside>
         )}
       </div>