chore: exclude auth tests from root vitest

Auth package has its own test runner (node --test) configured.
Exclude auth directory from root vitest to prevent no-test-suite error.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

vitest.config.ts

@@ -7,6 +7,6 @@ export default defineConfig({
     environment: 'jsdom',
     globals: true,
     setupFiles: ['./src/test/setup.ts'],
-    exclude: ['e2e/**', 'node_modules/**'],
+    exclude: ['e2e/**', 'auth/**', 'node_modules/**'],
   },
 })