feat(infra): migrate to rsbuild

packages/stl/vitest.config.ts

@@ -0,0 +1,8 @@
+import { baseVitestConfig } from '@ermnvldmr/rsbuild-config/vitest';
+import { mergeConfig } from 'vitest/config';
+
+export default mergeConfig(baseVitestConfig, {
+  test: {
+    // Package specific overrides
+  },
+});