feat(comments): 软删占位、理由与恢复，管理删仅对访客打码

自删/管理删差异文案与理由可见性，评论者与管理员免马赛克，并支持恢复与处理人链接。

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

frontend/app/admin/content/ContentAdmin.tsx

@@ -35,6 +35,7 @@ import { toast } from "@/lib/toast";
 import Avatar from "@/components/Avatar";
 import ConfirmDialog from "@/components/ConfirmDialog";
 import StaffDeletePostModal from "@/components/StaffDeletePostModal";
+import DeleteCommentModal from "@/components/DeleteCommentModal";
 
 const PAGE_SIZE = 15;
 
@@ -142,6 +143,8 @@ export default function ContentAdmin({
   const [confirmBusy, setConfirmBusy] = useState(false);
   const [staffDeletePost, setStaffDeletePost] = useState<AdminContentPost | null>(null);
   const [staffDeleteBusy, setStaffDeleteBusy] = useState(false);
+  const [staffDeleteComment, setStaffDeleteComment] = useState<AdminContentComment | null>(null);
+  const [staffDeleteCommentBusy, setStaffDeleteCommentBusy] = useState(false);
 
   const refreshCounts = useCallback(() => {
     apiAdminContentCounts().then(setCounts).catch(() => {});
@@ -605,18 +608,7 @@ export default function ContentAdmin({
                       type="button"
                       className="btn btn-line btn-sm"
                       disabled={busy}
-                      onClick={() =>
-                        askConfirm(
-                          "移入回收站",
-                          "确定软删这条评论吗？可在「已删除」中恢复。",
-                          () =>
-                            apiAdminSoftDeleteComment(c.id).then(() => {
-                              toast("已移入回收站", "ok");
-                              reload(commentsPage);
-                            }),
-                          true
-                        )
-                      }
+                      onClick={() => setStaffDeleteComment(c)}
                     >
                       <Trash2 size={14} /> 删除
                     </button>
@@ -702,6 +694,25 @@ export default function ContentAdmin({
             .finally(() => setStaffDeleteBusy(false));
         }}
       />
+
+      <DeleteCommentModal
+        open={!!staffDeleteComment}
+        mode="staff"
+        busy={staffDeleteCommentBusy}
+        onClose={() => !staffDeleteCommentBusy && setStaffDeleteComment(null)}
+        onConfirm={(opts) => {
+          if (!staffDeleteComment) return;
+          setStaffDeleteCommentBusy(true);
+          apiAdminSoftDeleteComment(staffDeleteComment.id, opts)
+            .then(() => {
+              toast("已移入回收站", "ok");
+              setStaffDeleteComment(null);
+              reload(commentsPage);
+            })
+            .catch((e) => toast(e instanceof Error ? e.message : "操作失败"))
+            .finally(() => setStaffDeleteCommentBusy(false));
+        }}
+      />
     </div>
   );
 }