docs: replace LINUX DO link with openrelay.cc community forum

Add forum.openrelay.cc badge in header. Update community section in
both Chinese and English to point to the new official forum at
openrelay.cc as the primary community channel.

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

README.md

@@ -10,6 +10,7 @@
   <a href="https://github.com/romgX/openrelay/releases/latest"><img src="https://img.shields.io/github/v/release/romgX/openrelay?color=blue&label=download" alt="Latest Release"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-Open%20Core-blue" alt="License"></a>
   <img src="https://img.shields.io/badge/platform-macOS%20%7C%20Windows%20%7C%20Linux-lightgrey" alt="Platform">
+  <a href="https://openrelay.cc"><img src="https://img.shields.io/badge/forum-openrelay.cc-0070f3" alt="Community Forum"></a>
   <a href="https://t.me/openrelay_updates"><img src="https://img.shields.io/badge/Telegram-updates-blue?logo=telegram" alt="Telegram"></a>
   <a href="https://t.me/openrelay_chat"><img src="https://img.shields.io/badge/Telegram-chat-blue?logo=telegram" alt="Chat"></a>
 </p>
@@ -167,13 +168,13 @@ chmod +x openrelay-linux-x64
 
 ## 社区
 
+- **官方社区论坛**：[openrelay.cc](https://openrelay.cc) — 攻略、Provider 评测、跳蚤市场、Bug 反馈
 - QQ 群：**1087788461**
-- LINUX DO：[linux.do](https://linux.do)
 - Telegram 讨论群：[t.me/openrelay_chat](https://t.me/openrelay_chat)
 - Telegram 更新频道：[t.me/openrelay_updates](https://t.me/openrelay_updates)
 - 问题反馈：[GitHub Issues](https://github.com/romgX/openrelay/issues)
 
-点个 **Star** ⭐ + 加入 [Telegram 群](https://t.me/openrelay_chat)，有机会领 **1 个月 Pro 体验码**。
+点个 **Star** ⭐ + 加入 [社区](https://openrelay.cc) 或 [Telegram 群](https://t.me/openrelay_chat)，有机会领 **1 个月 Pro 体验码**。
 
 ## 许可证
 
@@ -380,13 +381,13 @@ Having trouble? Check the **[FAQ (English)](faq-en.md)** | **[常见问题 (中
 
 ## Community
 
+- **Official Community Forum**: [openrelay.cc](https://openrelay.cc) — guides, provider reviews, marketplace, bug reports
 - QQ Group / QQ 群: **1087788461**
-- LINUX DO: [linux.do](https://linux.do)
 - Telegram Chat: [t.me/openrelay_chat](https://t.me/openrelay_chat)
 - Telegram Updates: [t.me/openrelay_updates](https://t.me/openrelay_updates)
 - Issues: [GitHub Issues](https://github.com/romgX/openrelay/issues)
 
-**Star** ⭐ this repo + join [Telegram group](https://t.me/openrelay_chat) → chance to get **1-2 months Pro free**.
+**Star** ⭐ this repo + join [forum](https://openrelay.cc) or [Telegram group](https://t.me/openrelay_chat) → chance to get **1-2 months Pro free**.
 
 ## License