chore(assets): add 512px app icon

DongDuong2001 · DongDuong2001 · commit 736663895b1a · 2026-04-06T12:34:11.000+07:00
diff --git a/public/icons/icon-512.svg b/public/icons/icon-512.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" fill="#0a0a0a" rx="64"/>
+  <text x="256" y="335" font-family="system-ui, -apple-system, sans-serif" font-size="220" font-weight="bold" fill="#00FF99" text-anchor="middle">L</text>
+</svg>
