fix: Kiro/AG/Xiaomi providers, fusion tool history, vision models version 0.5.4
Fixes:
- Kiro: honor thinking effort budgets
- AG/Kiro/Xiaomi: provider fixes
- Combo/Fusion: flatten tool history in panel calls to prevent 503
- LLM selector: show custom vision models in selector and model list
- Image: prevent compatible nodes from shadowing provider aliases