fix(panel): make the LuckPerms page honest about what the server said (#59)

Live with real LuckPerms 5.5.85: every lp command returns an empty RCON body
(list/plugins answer normally; a standalone RCON client sees the same, and
creategroup/permission-set still persist), so the read projection can never
populate and the page asserted "no parent groups / no explicit nodes" for a
state it could not actually read. The raw reply now rides the same disclosure
the rosters carry, a silent entry-less reply shows an explicit notice instead
of the false empty claims, and the write history's placeholder no longer
dresses up a fabricated "[RCON] ..." line as output.

panel/src/i18n/resources/zh-CN/servers.json

@@ -159,6 +159,8 @@
   "luckperms_revert_success": "已成功撤销该操作！",
   "luckperms_presets": "预设",
   "luckperms_no_parent_groups": "未分配任何父组",
+  "luckperms_no_reply": "服务器没有返回可解析的数据——部分 LuckPerms 版本不通过 RCON 回包，下面的用户组/权限列表可能不准确；授予与撤销操作仍然会实际生效。",
+  "luckperms_no_output": "（服务器未返回输出）",
   "luckperms_global": "全局",
   "luckperms_no_perms": "尚未分配任何权限节点",
   "luckperms_rcon_output": "RCON 控制台输出",