Update the project logo to the new V3 Beta release image

README.md

@@ -1,6 +1,6 @@
 <div align="center">
   <a href="https://github.com/alvinunreal/oh-my-opencode-slim/stargazers">
-    <img src="img/v2.jpg" alt="oh-my-opencode-slim V2 Release" style="border-radius: 10px;">
+    <img src="img/v3-beta.webp" alt="oh-my-opencode-slim V3 Beta Release" style="border-radius: 10px;">
   </a>
   <h3>✨ oh-my-opencode-slim ✨</h3>