* test: add E2E tests for auto-reply settings
Add auto-reply.spec.ts with two test cases:
- GET empty → POST save → GET verify saved fields
- POST with too-long subject returns 400
Enable ENABLE_AUTO_REPLY in E2E wrangler config.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* test: add full fields and body assertion for too-long validation per review
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
