docs: set Thai README as default landing page and add link to FFGO

README_EN.md

@@ -5,7 +5,7 @@
 **Modern, High-Performance Honkai: Star Rail Game Server Emulator in Go**  
 Ported from `GaC-hkrpg-ps` with protocol references from `PearlSR` & `Currency-War-SR`.
 
-[English](README_EN.md) | [ภาษาไทย](README.md)
+[ภาษาไทย](README.md) | [English](README_EN.md)
 
 </div>
 
@@ -98,7 +98,7 @@ Priority Order: **Environment Variables > `server.local.json` > `server.json`**
 - **March7thHoney ([Mar7thLover/March7thHoney-OpenSource](https://github.com/Mar7thLover/March7thHoney-OpenSource))**:
   - High-performance C#/.NET server oracle referenced for gacha pull algorithms, pity system math, shop mechanics, and Muip admin protocols.
 
-- **FFGO / FireflyServer Community**:
+- **FFGO ([git.kain.io.vn](https://git.kain.io.vn/))**:
   - Open-source server emulation research and protocol oracle referenced for network workflow transitions, command sequencing, and packet compatibility verification.
 
 </details>