- Add draftCustomEndpoints state to collect custom endpoints from speed test modal
- Import CustomEndpoint type from @/types
- Update handleSubmit to collect and package endpoints into meta.custom_endpoints:
* User-added custom endpoints (from draftCustomEndpoints)
* Preset endpointCandidates (if any)
* Current Base URL (baseUrl/codexBaseUrl)
- Add onCustomEndpointsChange callback to both Claude and Codex EndpointSpeedTest instances
- Extend ProviderFormValues type to include meta.custom_endpoints field
- Only creates meta.custom_endpoints for new providers (not edit mode)
- Deduplicates URLs and creates CustomEndpoint entries with addedAt timestamp
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