test(auth): allow bcrypt hash tests to finish

What changed:
- Added an auth package Vitest config with the existing forks pool and a 15s test timeout.
- Kept production bcryptjs salt rounds and test assertions unchanged.

Why:
- On this machine one 12-round bcryptjs hash can exceed Vitest's default 5s timeout, making the auth suite fail even though the implementation succeeds.

Verification:
- pnpm --filter @bytelyst/auth build
- pnpm --filter @bytelyst/auth test
- pnpm --filter @bytelyst/auth exec eslint . --ext .ts,.tsx

packages/auth/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    pool: 'forks',
+    testTimeout: 15_000,
+  },
+});