feat: 书库导入导出/图片变体/书籍搜索/小组件运行时等

新增：
- 书库导入导出（library_import/library_export）及测试
- 图片变体生成（image_variants）与响应式图片（responsiveImage）
- 书籍搜索（bookSearch）+ BookSearch/LibrarySearchGrid 组件
- 小组件运行时（widgetRuntime）与静态检查（widgetLint）
- 上传缓存中间件（upload_cache）与字体 CSS 提取脚本

其它：
- 后端 handlers/services 全量调整
- 前端页面、组件、库函数与配置更新

frontend/app/notifications/NotificationsClient.tsx

@@ -3,18 +3,28 @@
 import { useState } from "react";
 import { useRouter } from "next/navigation";
 import Link from "next/link";
-import { Heart, MessageCircle, CheckCheck, Bell, CheckCircle2, XCircle, AtSign, ClipboardList, Award, AlertTriangle, UserPlus } from "lucide-react";
+import { Heart, MessageCircle, CheckCheck, Bell, CheckCircle2, XCircle, AtSign, ClipboardList, Award, AlertTriangle, UserPlus, ChevronRight } from "lucide-react";
 import { apiMarkRead, apiMarkAllRead, type NotificationsResponse, type NotificationItem } from "@/lib/api";
 import { useUrlStyle } from "@/components/SiteBrandProvider";
-import { postPath, userPath } from "@/lib/urlStyle";
+import { postPath, userPath, commentAnchor } from "@/lib/urlStyle";
 
 /**
  * 通知列表交互层：数据由服务端 SSR 直出，这里只承担已读标记等客户端操作。
+ * 布局：左栏 sticky 概览（未读数/全部已读）+ 右列紧凑列表（单条两行内）。
  */
-export default function NotificationsClient({ initialData }: { initialData: NotificationsResponse }) {
+export default function NotificationsClient({
+  initialData,
+  initialUnread,
+  children,
+}: {
+  initialData: NotificationsResponse;
+  initialUnread: number;
+  children?: React.ReactNode;
+}) {
   const router = useRouter();
   const urlStyle = useUrlStyle();
   const [notifications, setNotifications] = useState<NotificationItem[]>(initialData.notifications || []);
+  const [unreadCount, setUnreadCount] = useState(initialUnread);
 
   const handleClick = async (n: NotificationItem) => {
     if (!n.is_read) {
@@ -22,6 +32,7 @@ export default function NotificationsClient({ initialData }: { initialData: Noti
       setNotifications((list) =>
         list.map((item) => (item.id === n.id ? { ...item, is_read: true } : item))
       );
+      setUnreadCount((c) => Math.max(0, c - 1));
     }
     // @提及通知跳到群聊房间；徽章通知无关联帖子（仅标已读）；关注通知跳到关注者主页；其余跳到帖子/评论
     if (n.type === "mention" && n.room_id) {
@@ -32,9 +43,11 @@ export default function NotificationsClient({ initialData }: { initialData: Noti
       return;
     } else if (n.type === "follow") {
       router.push(userPath(urlStyle, n.actor_id));
-    } else if (n.comment_id > 0) {
+    } else if (n.comment_id > 0 && n.comment_floor) {
       // 评论/回复/点赞等：直达评论所在楼层（跨页由帖子页深链定位换页）
-      router.push(`${postPath(urlStyle, n.post_id)}#comment-${n.comment_id}`);
+      router.push(
+        `${postPath(urlStyle, n.post_id)}${commentAnchor(n.comment_floor, n.comment_is_root ?? true, n.comment_id)}`
+      );
     } else {
       router.push(postPath(urlStyle, n.post_id));
     }
@@ -43,6 +56,7 @@ export default function NotificationsClient({ initialData }: { initialData: Noti
   const handleMarkAll = async () => {
     await apiMarkAllRead();
     setNotifications((list) => list.map((item) => ({ ...item, is_read: true })));
+    setUnreadCount(0);
     // 同步刷新 Header 未读红点（layout 重新取 unread_count）
     router.refresh();
   };
@@ -57,157 +71,176 @@ export default function NotificationsClient({ initialData }: { initialData: Noti
     return `${Math.floor(hour / 24)} 天前`;
   };
 
-  const hasUnread = notifications.some((n) => !n.is_read);
+  const iconOf = (n: NotificationItem) => {
+    const t = n.type;
+    const node =
+      t === "approved" ? <CheckCircle2 size={15} />
+      : t === "rejected" || t === "deleted" ? <XCircle size={15} />
+      : t === "necro_reply" ? <AlertTriangle size={15} />
+      : t === "like" ? <Heart size={15} />
+      : t === "mention" ? <AtSign size={15} />
+      : t === "pending_review" ? <ClipboardList size={15} />
+      : t === "badge" ? <Award size={15} />
+      : t === "follow" ? <UserPlus size={15} />
+      : <MessageCircle size={15} />;
+    const color =
+      t === "approved" ? "var(--ok)"
+      : t === "rejected" || t === "deleted" || t === "necro_reply" ? "var(--danger)"
+      : t === "like" ? "var(--clay)"
+      : t === "badge" ? "var(--gold)"
+      : "var(--accent)";
+    const bg =
+      t === "approved" ? "var(--ok-soft)"
+      : t === "rejected" || t === "deleted" || t === "necro_reply" ? "var(--danger-soft)"
+      : t === "like" ? "var(--clay-soft)"
+      : t === "badge" ? "var(--gold-soft)"
+      : "var(--accent-soft)";
+    return { node, color, bg };
+  };
 
   return (
     <>
-      {hasUnread && (
-        <div className="flex justify-end mb-4">
-          <button onClick={handleMarkAll} className="btn btn-line btn-sm">
+      {/* 左栏：概览 + 全部已读（lg 起 sticky） */}
+      <aside className="panel p-4 sm:p-5 lg:sticky lg:top-[var(--rail-top)]">
+        <p className="text-xs font-bold tracking-widest uppercase" style={{ color: "var(--ink-3)" }}>概览</p>
+        <div className="mt-2.5 flex items-baseline gap-1.5">
+          <span
+            className="text-[30px] leading-none font-extrabold"
+            style={{ color: unreadCount > 0 ? "var(--accent)" : "var(--ink)", fontVariantNumeric: "tabular-nums" }}
+          >
+            {unreadCount}
+          </span>
+          <span className="meta">条未读</span>
+        </div>
+        <p className="meta mt-1.5">共 {initialData.total} 条通知</p>
+        <div className="my-3.5" style={{ borderTop: "1px solid var(--line)" }} />
+        {unreadCount > 0 ? (
+          <button onClick={handleMarkAll} className="btn btn-line btn-sm w-full justify-center">
             <CheckCheck size={14} /> 全部已读
           </button>
-        </div>
-      )}
+        ) : (
+          <p className="meta flex items-center gap-1.5" style={{ color: "var(--ok)" }}>
+            <CheckCircle2 size={14} /> 通知都已读完
+          </p>
+        )}
+      </aside>
 
-      {notifications.length === 0 ? (
-        <div className="panel text-center py-20 px-6">
-          <span
-            className="inline-flex w-14 h-14 rounded-full items-center justify-center mb-4"
-            style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
-          >
-            <Bell size={26} />
-          </span>
-          <p className="font-bold text-lg" style={{ color: "var(--ink)" }}>还没有通知</p>
-          <p className="meta mt-1.5">当有人评论或点赞你的帖子时，会在这里提醒你</p>
-        </div>
-      ) : (
-        <div className="panel overflow-hidden p-0">
-          {notifications.map((n, i) => {
-            const approval = n.type === "approved" || n.type === "rejected";
-            // 系统提醒（ActorID=0）：不渲染操作者链接，仅展示标题与内容
-            const system = n.type === "necro_reply";
-            const iconNode = n.type === "approved"
-              ? <CheckCircle2 size={16} />
-              : n.type === "rejected" || n.type === "deleted"
-                ? <XCircle size={16} />
-                : n.type === "necro_reply"
-                  ? <AlertTriangle size={16} />
-                  : n.type === "like"
-                    ? <Heart size={16} />
-                    : n.type === "mention"
-                      ? <AtSign size={16} />
-                      : n.type === "pending_review"
-                        ? <ClipboardList size={16} />
-                        : n.type === "badge"
-                          ? <Award size={16} />
-                          : n.type === "follow"
-                            ? <UserPlus size={16} />
-                            : <MessageCircle size={16} />;
-            const iconColor = n.type === "approved"
-              ? "var(--ok)"
-              : n.type === "rejected" || n.type === "deleted" || n.type === "necro_reply"
-                ? "var(--danger)"
-                : n.type === "like"
-                  ? "var(--clay)"
-                  : n.type === "badge"
-                    ? "var(--gold)"
-                    : "var(--accent)";
-            const iconBg = n.type === "approved"
-              ? "var(--ok-soft)"
-              : n.type === "rejected" || n.type === "deleted" || n.type === "necro_reply"
-                ? "var(--danger-soft)"
-                : n.type === "like"
-                  ? "var(--clay-soft)"
-                  : n.type === "badge"
-                    ? "var(--gold-soft)"
-                    : "var(--accent-soft)";
-            return (
-            <button
-              key={n.id}
-              onClick={() => handleClick(n)}
-              className={`w-full text-left px-4 sm:px-5 py-4 flex items-start gap-3.5 transition-colors hover:bg-[var(--panel-2)] focus-visible:bg-[var(--panel-2)] ${
-                n.is_read ? "" : "bg-[var(--panel-2)]"
-              }`}
-              style={{
-                borderTop: i === 0 ? "none" : "1px solid var(--line)",
-              }}
+      {/* 右列：紧凑通知列表 + 分页 */}
+      <div className="min-w-0">
+        {notifications.length === 0 ? (
+          <div className="panel text-center py-16 px-6">
+            <span
+              className="inline-flex w-12 h-12 rounded-full items-center justify-center mb-3.5"
+              style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
             >
-              <span
-                className="w-10 h-10 shrink-0 rounded-full flex items-center justify-center"
-                style={{ color: iconColor, background: iconBg }}
-              >
-                {iconNode}
-              </span>
-              <div className="flex-1 min-w-0">
-                <p className="text-sm leading-snug" style={{ color: "var(--ink)" }}>
-                  {approval ? (
+              <Bell size={22} />
+            </span>
+            <p className="font-bold" style={{ color: "var(--ink)" }}>还没有通知</p>
+            <p className="meta mt-1">当有人评论或点赞你的帖子时，会在这里提醒你</p>
+          </div>
+        ) : (
+          <div className="panel overflow-hidden p-0">
+            {notifications.map((n, i) => {
+              const approval = n.type === "approved" || n.type === "rejected";
+              // 系统提醒（ActorID=0）：不渲染操作者链接，仅展示标题与内容
+              const system = n.type === "necro_reply";
+              const icon = iconOf(n);
+              return (
+                <button
+                  key={n.id}
+                  onClick={() => handleClick(n)}
+                  className="relative w-full text-left pl-4 pr-3 sm:pr-4 py-2.5 flex items-center gap-3 transition-colors hover:bg-[var(--item-hover-bg)] focus-visible:bg-[var(--item-hover-bg)]"
+                  style={{
+                    borderTop: i === 0 ? "none" : "1px solid var(--line)",
+                  }}
+                >
+                  {/* 未读：左侧主题色竖条（已读透明占位，文本基线对齐不跳） */}
+                  <span
+                    aria-hidden
+                    className="absolute left-0 top-2 bottom-2 w-[3px] rounded-full"
+                    style={{ background: n.is_read ? "transparent" : "var(--accent)" }}
+                  />
+                  <span
+                    className="w-[30px] h-[30px] shrink-0 rounded-[9px] flex items-center justify-center"
+                    style={{ color: icon.color, background: icon.bg }}
+                  >
+                    {icon.node}
+                  </span>
+                  <div className="flex-1 min-w-0">
+                    <p className="text-[13.5px] leading-snug flex items-baseline gap-x-1.5" style={{ color: "var(--ink)" }}>
+                      {approval ? (
+                        <span
+                          className="font-bold shrink-0"
+                          style={{ color: n.type === "approved" ? "var(--ok)" : "var(--danger)" }}
+                        >
+                          {n.type === "approved" ? "审核通过" : "未通过审核"}
+                        </span>
+                      ) : system ? (
+                        <span className="font-bold shrink-0" style={{ color: "var(--danger)" }}>
+                          旧帖回复提醒
+                        </span>
+                      ) : (
+                        <>
+                          <Link
+                            href={userPath(urlStyle, n.actor.id)}
+                            onClick={(e) => e.stopPropagation()}
+                            className="font-semibold shrink-0 max-w-[10em] truncate hover:text-[var(--accent)] transition-colors"
+                          >
+                            {n.actor.nickname}
+                          </Link>
+                          <span className="meta shrink-0">
+                            {n.type === "comment"
+                              ? "评论了你的帖子"
+                              : n.type === "reply"
+                                ? "回复了你的评论"
+                                : n.type === "mention"
+                                  ? "在群中提到了你"
+                                  : n.type === "pending_review"
+                                    ? "有新内容待审核"
+                                    : n.type === "deleted"
+                                      ? "删除了你的帖子"
+                                      : n.type === "badge"
+                                        ? "向你颁布了徽章"
+                                        : n.type === "follow"
+                                          ? "关注了你"
+                                          : "点赞了你的帖子"}
+                          </span>
+                        </>
+                      )}
+                      {n.type === "mention"
+                        ? n.room && (
+                            <span className="truncate min-w-0" style={{ color: "var(--ink-2)" }}>
+                              # {n.room.name}
+                            </span>
+                          )
+                        : n.post && (
+                            <span className="truncate min-w-0" style={{ color: "var(--ink-2)" }}>
+                              《{n.post.title}》
+                            </span>
+                          )}
+                      <span className="meta text-xs shrink-0 ml-auto pl-2">{formatTime(n.created_at)}</span>
+                    </p>
+                    {n.content && (
+                      <p className="text-[13px] mt-0.5 truncate" style={{ color: "var(--ink-3)" }}>
+                        {n.content}
+                      </p>
+                    )}
+                  </div>
+                  {n.type === "follow" && (
                     <span
-                      className="font-bold"
-                      style={{ color: n.type === "approved" ? "var(--ok)" : "var(--danger)" }}
+                      className="shrink-0 inline-flex items-center gap-0.5 text-xs font-semibold"
+                      style={{ color: "var(--accent)" }}
                     >
-                      {n.type === "approved" ? "审核通过" : "未通过审核"}
+                      查看主页 <ChevronRight size={13} />
                     </span>
-                  ) : system ? (
-                    <span className="font-bold" style={{ color: "var(--danger)" }}>
-                      旧帖回复提醒
-                    </span>
-                  ) : (
-                    <>
-                      <Link
-                        href={userPath(urlStyle, n.actor.id)}
-                        onClick={(e) => e.stopPropagation()}
-                        className="font-semibold hover:text-[var(--accent)] transition-colors"
-                      >
-                        {n.actor.nickname}
-                      </Link>{" "}
-                      <span className="meta">
-                        {n.type === "comment"
-                          ? "评论了你的帖子"
-                          : n.type === "reply"
-                            ? "回复了你的评论"
-                            : n.type === "mention"
-                              ? "在消息中提到了你"
-                              : n.type === "pending_review"
-                                ? "有新内容待审核"
-                                : n.type === "deleted"
-                                  ? "删除了你的帖子"
-                                  : n.type === "badge"
-                                  ? "向你颁布了徽章"
-                                  : n.type === "follow"
-                                    ? "关注了你"
-                                    : "点赞了你的帖子"}
-                      </span>
-                    </>
                   )}
-                </p>
-                {n.type === "mention" ? (
-                  n.room && (
-                    <p className="text-sm mt-1 truncate" style={{ color: "var(--ink-2)" }}>
-                      # {n.room.name}
-                    </p>
-                  )
-                ) : (
-                  n.post && (
-                    <p className="text-sm mt-1 truncate" style={{ color: "var(--ink-2)" }}>
-                      《{n.post.title}》
-                    </p>
-                  )
-                )}
-                {n.content && (
-                  <p className="text-[13px] mt-1.5 line-clamp-2" style={{ color: "var(--ink-3)" }}>
-                    {n.content}
-                  </p>
-                )}
-                <p className="meta text-xs mt-2">{formatTime(n.created_at)}</p>
-              </div>
-              {!n.is_read && (
-                <span className="w-2.5 h-2.5 shrink-0 mt-2 rounded-full" style={{ background: "var(--clay)" }} />
-              )}
-            </button>
-            );
-          })}
-        </div>
-      )}
+                </button>
+              );
+            })}
+          </div>
+        )}
+        {children}
+      </div>
     </>
   );
 }