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Keep custom primary model ID consistent with configured model

For custom accounts, this now derives primary from only the last path segment (e.g. anthropic/claude-3-5-sonnet becomes custom/claude-3-5-sonnet), while the configured model entry keeps the full ID (customModelID). When a custom model name contains / (common with gateway-style model IDs), agents.defaults.model.primary no longer points at the same model entry written under models.providers.custom.models, so the agent can resolve an undefined/wrong default model at runtime.

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