docs(readme): mark translations as pre-v2 pending update

The Chinese and Japanese READMEs still describe the v1 architecture
(setup flow, channel list, "main channel" concept, etc.). Add a notice
at the top of each pointing readers to the English README for current
content until the translations are refreshed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README_zh.md

@@ -13,6 +13,9 @@
   <a href="https://discord.gg/VDdww8qS42"><img src="https://img.shields.io/discord/1470188214710046894?label=Discord&logo=discord&v=2" alt="Discord" valign="middle"></a>&nbsp; • &nbsp;
   <a href="repo-tokens"><img src="repo-tokens/badge.svg" alt="34.9k tokens, 17% of context window" valign="middle"></a>
 </p>
+
+> **注意：** 此中文翻译对应 v1 版本，已不反映最新的 v2 架构。请参考 [README.md](README.md) 获取最新内容。
+
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