New: add Crant AI Studio provider

[Detritalw]

Summary

• Add Crant AI Studio as a new provider with 47 models
• Models include DeepSeek V4, Kimi K1.5/K2, Qwen (Max/Plus/Coder/Omni/VL), Qwen3.5/3.6 series, MiMo V2/2.5, and GLM-4/5 series
• Uses @ai-sdk/openai-compatible with API endpoint https://studio.crantai.com/v1

Models

• 25 extends-based: Inherit from canonical providers (deepseek, alibaba, moonshotai, zhipuai, xiaomi) with cost overrides where Crant pricing differs
• 22 standalone: DeepSeek search variants, Kimi K1.5, Qwen3.5-flash/max/omni, GLM-4.x series, MiMo TTS variants

Validation

• All 47 models pass bun validate
• Prices verified against provider's CSV pricing data