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/admin/announcements/AnnouncementAdmin.tsx

@@ -191,7 +191,7 @@ export default function AnnouncementAdmin() {
                     <button
                       key={c.value}
                       type="button"
-                      title={c.label}
+                      data-tip={c.label}
                       aria-label={c.label}
                       aria-pressed={form.tag_color === c.value}
                       className={`j13-anno-dot is-${c.value}`}
@@ -322,7 +322,7 @@ export default function AnnouncementAdmin() {
                   <p
                     className="mt-1 truncate text-[14px] font-semibold"
                     style={{ color: "var(--ink)" }}
-                    title={a.title}
+                    data-tip={a.title}
                   >
                     {a.title}
                   </p>
@@ -334,7 +334,7 @@ export default function AnnouncementAdmin() {
                       target="_blank"
                       className="w-8 h-8 inline-flex items-center justify-center rounded-full transition-colors hover:bg-[var(--accent-soft)] focus-visible:bg-[var(--accent-soft)]"
                       style={{ color: "var(--ink-3)" }}
-                      title="查看"
+                      data-tip="查看"
                       aria-label="查看公告"
                     >
                       <ExternalLink size={15} />
@@ -344,7 +344,7 @@ export default function AnnouncementAdmin() {
                     onClick={() => startEdit(a)}
                     className="w-8 h-8 inline-flex items-center justify-center rounded-full transition-colors hover:bg-[var(--accent-soft)] focus-visible:bg-[var(--accent-soft)]"
                     style={{ color: "var(--ink-3)" }}
-                    title="编辑"
+                    data-tip="编辑"
                     aria-label="编辑公告"
                   >
                     <Pencil size={15} />
@@ -356,7 +356,7 @@ export default function AnnouncementAdmin() {
                     style={{ color: "var(--ink-3)" }}
                     onMouseEnter={(e) => (e.currentTarget.style.color = "var(--danger)")}
                     onMouseLeave={(e) => (e.currentTarget.style.color = "var(--ink-3)")}
-                    title="删除"
+                    data-tip="删除"
                     aria-label="删除公告"
                   >
                     {deletingId === a.id ? <Loader2 size={15} className="animate-spin" /> : <Trash2 size={15} />}