feat(angular-rspack): move angular rspack

Author: Coly010

README.md

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+<div style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 20px; border-radius: 8px; margin-bottom: 20px; text-align: center;">
+  <h2 style="margin: 0 0 10px 0; font-size: 1.5em;">📢 Angular Rspack has moved!</h2>
+  <p style="margin: 0 0 15px 0; font-size: 1.1em;">
+    This repository is <strong>no longer actively maintained</strong>.
+  </p>
+  <p style="margin: 0 0 15px 0;">
+    Angular Rspack is now part of the official <strong>Nx monorepo</strong> at 
+    <a href="https://github.com/nrwl/nx" style="color: #ffd700; text-decoration: underline; font-weight: bold;">github.com/nrwl/nx</a>
+  </p>
+  <p style="margin: 0; font-size: 0.95em;">
+    Please file new issues and contribute at the <a href="https://github.com/nrwl/nx/issues" style="color: #ffd700; text-decoration: underline;">Nx repository</a>
+  </p>
+</div>
+
 <div style="text-align: center; margin: 0 auto;">
 
 <img src="./rsbuild-plugin-angular.png" alt="Rsbuild Plugin Angular" />