feat(provider): add FuturMix as built-in provider

[FuturMix]

Summary

Add FuturMix as a built-in provider. FuturMix is a multi-model AI API hub that provides access to 22+ models from Anthropic, Google, and OpenAI .

• API: OpenAI-compatible ((see futurmix.ai))
• Models: Claude Opus/Sonnet/Haiku, Gemini 2.5 Pro/Flash, GPT-5.4/Mini, and more
• SLA: 99.99% uptime

Changes

Following the existing provider pattern (SiliconFlow, VolcEngine):

1. src/shared/types/provider.ts — Add FuturMix = 'futurmix' to ModelProviderEnum
2. src/shared/providers/definitions/models/futurmix.ts — Model class extending OpenAICompatible
3. src/shared/providers/definitions/futurmix.ts — Provider definition with 9 curated models
4. src/shared/providers/index.ts — Register side-effect import
5. src/shared/model-registry/provider-mapping.ts — Add models.dev mapping
6. src/renderer/static/icons/providers/futurmix.png — Provider icon

Test plan

• Provider appears in the model provider dropdown
• API key and host can be configured
• Models appear in model selector
• Chat works end-to-end with FuturMix API

🤖 Generated with Claude Code

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[FuturMix]

Friendly ping — this PR adds FuturMix as a provider following the SiliconFlow/VolcEngine pattern. Ready for review.

[billfelix]

收到，谢谢您的来信。我将及时回复您！ 祝好！

[FuturMix]

Hi @billfelix — circling back on this one. The PR adds FuturMix as a built-in provider following the same pattern as SiliconFlow and VolcEngine.

Current status:

• Mergeable state is clean, no conflicts
• CodeRabbit auto-review was skipped per repo settings, but the code follows existing provider patterns exactly

Since the ChatBox project supports many providers and this is a straightforward addition (config + icon), would you be able to give it a review when you have a moment? Happy to make any adjustments if needed.

Thanks for the quick acknowledgment earlier!