* feat: improve local provider connectivity with CORS bypass
- Add @tauri-apps/plugin-http dependency
- Implement dual fetch strategy for local vs remote providers
- Auto-detect local providers (localhost, Ollama:11434, LM Studio:1234)
- Make API key optional for local providers
- Add comprehensive test coverage for provider fetching
refactor: simplify fetchModelsFromProvider by removing preflight check logic
* feat: extend config options to include custom fetch function for CORS handling
* feat: conditionally use Tauri's fetch for openai-compatible providers to handle CORS
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