- Create useSpeedTestEndpoints hook that collects endpoints from:
1. Current baseUrl/codexBaseUrl
2. Initial data URL (edit mode)
3. Preset's endpointCandidates array
- Pass speedTestEndpoints to ClaudeFormFields and CodexFormFields
- Update EndpointSpeedTest to use collected endpoints instead of just current URL
- Fix PackyCode preset endpoints not appearing in speed test modal