Feat/add bitdeer ai provider

[ruijietey]

Summary

Add Bitdeer AI (bitdeer-ai) as a first-class inference provider, enabling OpenAI-compatible inference routing through the Bitdeer AI API with environment-based credential discovery via BITDEERAI_API_KEY.

Related Issue

Changes

• Add BitdeerAiProvider plugin in openshell-providers with BITDEERAI_API_KEY env-var discovery
• Add BITDEER_AI_PROFILE inference profile (OpenAI-compatible, Bearer auth, default base URL https://api-inference.bitdeer.ai/v1)
• Register bitdeer-ai in profile_for(), ProviderRegistry, and normalize_provider_type() (accepts both bitdeer-ai and bitdeer)
• Add BitdeerAi variant to CliProviderType enum in the CLI
• Document bitdeer-ai in the provider reference table (docs/sandboxes/manage-providers.md)

Testing

• mise run pre-commit passes
• Unit tests added/updated
  • bitdeer_ai_profile_has_correct_defaults — verifies profile type, base URL, credential key, and auth header
  • discovers_bitdeer_ai_env_credentials — verifies env-var-based credential discovery
  • normalize_provider_type test extended to cover bitdeer-ai and bitdeer aliases
  • profile_for test extended to include bitdeer-ai lookup
• E2E tests added/updated (if applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)

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[github-actions]

Thank you for your interest in contributing to OpenShell, @ruijietey.

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To get vouched:

1. Open a Vouch Request discussion.
2. Describe what you want to change and why.
3. Write in your own words — do not have an AI generate the request.
4. A maintainer will comment /vouch if approved.
5. Once vouched, open a new PR (preferred) or reopen this one after a few minutes.

See CONTRIBUTING.md for details.

[johntmyers]

You can configure Bitdeer using the openai provider like this:

openshell provider create \
    --name bitdeer \
    --type openai \
    --credential OPENAI_API_KEY=<bitdeer_api_key> \
    --config OPENAI_BASE_URL=https://api-inference.bitdeer.ai/v1

That would be the preferred way so we do not have to maintain multiple providers for the same OpenAI protocol.