refactor(frontend): remove featured post component and simplify home page logic

移除了不再使用的FeaturePost组件，同时调整首页帖子展示逻辑：不再单独拆分今日精选帖，将所有非置顶帖子统一纳入普通列表展示，更新了置顶区的注释说明。

frontend/app/page.tsx

@@ -5,7 +5,6 @@ import { PenSquare, SearchX, MessagesSquare, Check, ArrowRight } from "lucide-re
 import { fetchPosts, fetchBoards } from "@/lib/api";
 import Pagination from "@/components/Pagination";
 import PostRow from "@/components/PostRow";
-import FeaturePost from "@/components/FeaturePost";
 import PinnedPosts from "@/components/PinnedPosts";
 
 export const metadata: Metadata = {
@@ -27,12 +26,10 @@ export default async function HomePage({ searchParams }: HomePageProps) {
     fetchBoards(),
   ]);
 
-  // 第一页且非搜索时拆分为三段：管理员置顶 → 今日精选（首条非置顶）→ 普通列表
+  // 第一页且非搜索时：管理员置顶独立成区，其余进入普通列表
   const split = page === 1 && !keyword;
   const pinned = split ? postsData.posts.filter((p) => p.pinned > 0) : [];
-  const normal = split ? postsData.posts.filter((p) => p.pinned <= 0) : postsData.posts;
-  const feature = split && normal.length > 0 ? normal[0] : null;
-  const rows = feature ? normal.slice(1) : normal;
+  const rows = split ? postsData.posts.filter((p) => p.pinned <= 0) : postsData.posts;
 
   return (
     <div>
@@ -63,11 +60,6 @@ export default async function HomePage({ searchParams }: HomePageProps) {
         {/* 主列 */}
         <div>
           <PinnedPosts posts={pinned} />
-          {feature && (
-            <div className="mb-6">
-              <FeaturePost post={feature} />
-            </div>
-          )}
 
           <div className="panel overflow-hidden">
             {rows.length > 0 ? (

frontend/components/FeaturePost.tsx

@@ -1,95 +0,0 @@
-import Link from "next/link";
-import type { PostListItem } from "@/lib/api";
-import LikeButton from "./LikeButton";
-import Avatar from "./Avatar";
-import { IconComment, IconEye } from "./Icons";
-
-function formatTime(dateStr: string) {
-  return new Date(dateStr).toLocaleDateString("zh-CN");
-}
-
-/**
- * 首页精选主卡：取自非置顶帖中的最新一帖（置顶帖由 PinnedPosts 承载）
- */
-export default function FeaturePost({ post }: { post: PostListItem }) {
-  return (
-    <article className="panel hover-lift group relative overflow-hidden">
-      {/* 柔和装饰块，非发光 */}
-      <span
-        aria-hidden
-        className="absolute -top-20 -right-16 w-56 h-56 rounded-full"
-        style={{ background: "var(--accent-soft)" }}
-      />
-      <div className="relative p-6 sm:p-8">
-        <div className="flex items-center gap-2 mb-4 flex-wrap">
-          <span
-            className="inline-flex items-center gap-1.5 text-[12.5px] font-bold"
-            style={{ color: "var(--accent)" }}
-          >
-            <span className="w-1.5 h-1.5 rounded-full" style={{ background: "var(--accent)" }} />
-            今日精选
-          </span>
-          {post.recommended && <span className="badge-rec">推荐</span>}
-          <Link href={`/board/${post.board.id}`} className="chip">
-            {post.board.name}
-          </Link>
-        </div>
-
-        <Link href={`/post/${post.id}`}>
-          <h2
-            className="font-extrabold text-2xl sm:text-[28px] leading-tight tracking-tight transition-colors group-hover:text-[var(--accent)]"
-            style={{ color: "var(--ink)" }}
-          >
-            {post.title}
-          </h2>
-        </Link>
-        {post.tags && (
-          <div className="flex flex-wrap gap-2 mt-4">
-            {[
-              ...new Set(
-                post.tags
-                  .split(",")
-                  .map((t) => t.trim())
-                  .filter(Boolean)
-              ),
-            ]
-              .slice(0, 4)
-              .map((t, i) => (
-                <span key={`${t}-${i}`} className="chip">
-                  # {t}
-                </span>
-              ))}
-          </div>
-        )}
-
-        <div className="flex items-center justify-between gap-4 mt-6 pt-5" style={{ borderTop: "1px solid var(--line)" }}>
-          <div className="flex items-center gap-4 min-w-0">
-            <Link href={`/u/${post.user.id}`} className="flex items-center gap-2.5 min-w-0 group/au">
-              <Avatar name={post.user.nickname || post.user.username} size={38} />
-              <span className="min-w-0">
-                <span
-                  className="block text-sm font-semibold truncate group-hover/au:text-[var(--accent)] transition-colors"
-                  style={{ color: "var(--ink)" }}
-                >
-                  {post.user.nickname}
-                </span>
-                <span className="meta block text-[11.5px]">{formatTime(post.created_at)}</span>
-              </span>
-            </Link>
-            <span className="hidden sm:inline-flex items-center gap-1.5 meta">
-              <IconComment size={14} /> {post.comment_count}
-            </span>
-            <span className="hidden sm:inline-flex items-center gap-1.5 meta">
-              <IconEye size={14} /> {post.view_count}
-            </span>
-          </div>
-          <LikeButton
-            postId={String(post.id)}
-            liked={post.liked}
-            likeCount={post.like_count}
-          />
-        </div>
-      </div>
-    </article>
-  );
-}

frontend/components/PinnedPosts.tsx

@@ -12,7 +12,7 @@ function formatTime(dateStr: string) {
 }
 
 /**
- * 管理员置顶区：独立于"今日精选"和普通列表。
+ * 管理员置顶区：独立于普通帖子列表。
  * 陶土色语义（与 badge-pin 一致），紧凑排列，一眼识别为公告性质内容。
  */
 export default function PinnedPosts({