Add comprehensive WebAuthn e2e/unit tests and virtual authenticator package

- Create @reviq/virtual-authenticator package with cryptographically valid
  WebAuthn credential generation for testing
- Add e2e tests for WebAuthn registration, authentication, passkey management
- Add unit tests for passkey-helpers and VirtualAuthenticator
- Add security tests for counter replay and tampered responses
- Configure test database environment in devenv.nix
- Add turbo.json test tasks and workspace configuration

Test results: 98 tests passing (54 virtual-authenticator, 25 e2e, 19 unit)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/testing/virtual-authenticator/eslint.config.js

@@ -0,0 +1,12 @@
+import { configs } from "@macalinao/eslint-config";
+
+export default [
+  ...configs.fast,
+  {
+    languageOptions: {
+      parserOptions: {
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+];