feat: 类型帖互动、积分经济与发帖体验

补齐问答采纳/重开、投票匿名与有票禁编、悬赏过期退回、抽奖回帖开奖，并接入积分账本与发帖附件可见性。

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

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

@@ -88,7 +88,7 @@ export default async function UserPage({ params, searchParams }: UserPageProps)
 
   const u = data.user;
   const joinDate = new Date(u.created_at).toLocaleDateString("zh-CN");
-  const showPoints = data.stats.points > 0;
+  const showPoints = data.stats.points > 0 || isOwner;
 
   // 导航项（桌面左栏 / 移动 chips 共用定义）
   const navItems: { key: UserTab; label: string; count?: number; icon: React.ReactNode; ownerOnly?: boolean }[] = [
@@ -359,7 +359,7 @@ export default async function UserPage({ params, searchParams }: UserPageProps)
             <section className="j13-module">
               <div className="flex items-center justify-between">
                 <p className="j13-module-title">
-                  <Flame size={15} style={{ color: "var(--clay)" }} /> 签到
+                  <Flame size={15} style={{ color: "var(--clay)" }} /> 积分
                 </p>
                 {data.stats.streak > 0 && (
                   <span
@@ -376,7 +376,16 @@ export default async function UserPage({ params, searchParams }: UserPageProps)
               >
                 {data.stats.points}
               </p>
-              <p className="meta text-[11px] mt-1.5">累计积分</p>
+              <p className="meta text-[11px] mt-1.5">可用余额</p>
+              {isOwner && (
+                <Link
+                  href="/points"
+                  className="inline-flex mt-3 text-[12.5px] font-semibold hover:text-[var(--accent)] transition-colors"
+                  style={{ color: "var(--ink-2)" }}
+                >
+                  查看流水 →
+                </Link>
+              )}
             </section>
           )}