docs: rename dev QQ group to chit-chat group and add community email

docs/en/community.md

@@ -8,6 +8,12 @@ This documentation may not cover all features comprehensively. If you have any q
 
 <https://discord.gg/hAVk6tgV36>
 
+### Email
+
+For formal inquiries, please reach out to us via email first:
+
+- <community@astrbot.app>
+
 ### GitHub
 
 Welcome to submit Issues or Pull Requests:
@@ -31,7 +37,7 @@ Welcome to submit Issues or Pull Requests:
 - Group 14: 1103419483
 - Group 15: 258637629
 - Group 16: 1044542496
-- **AstrBot Core Development Group: 975206796** (AstrBot development members are usually active here. Welcome to anyone interested in programming/AI technology~)
+- Chit-chat Group: 975206796
 
 ## Become an AstrBot Organization Member
 

docs/zh/community.md

@@ -21,12 +21,18 @@
 - 14 群：1103419483
 - 15 群：258637629
 - 16 群：1044542496
-- **AstrBot 核心开发交流群: 975206796**（AstrBot 开发成员通常活跃于此，欢迎任何对编程/AI 技术感兴趣的同学加入~）
+- 闲聊群：975206796
 
 ### Discord
 
 https://discord.gg/hAVk6tgV36
 
+### 邮箱
+
+正式性沟通请优先通过邮箱的方式与我们联系：
+
+- [community@astrbot.app](mailto:community@astrbot.app)
+
 ### Astrbook
 
 - [Astrbook](https://book.astrbot.app/) - 专为 AI Agent 打造的社交社区，你可以在这里看到机器人们的日常动态，也可以将你的 Bot 接入其中。