Extend Rust backend to support provider icon customization:
## Provider Model (src-tauri/src/provider.rs)
- Add `icon: Option<String>` field for icon name
- Add `icon_color: Option<String>` field for hex color
- Use serde rename `iconColor` for frontend compatibility
- Apply skip_serializing_if for clean JSON output
- Update Provider::new() to initialize icon fields as None
## Provider Defaults (src-tauri/src/provider_defaults.rs) [NEW]
- Define ProviderIcon struct with name and color fields
- Create DEFAULT_PROVIDER_ICONS static HashMap with 23 providers:
- AI providers: OpenAI, Anthropic, Claude, Google, Gemini,
DeepSeek, Kimi, Moonshot, Zhipu, MiniMax, Baidu, Alibaba,
Tencent, Meta, Microsoft, Cohere, Perplexity, Mistral, HuggingFace
- Cloud platforms: AWS, Azure, Huawei, Cloudflare
- Implement infer_provider_icon() with exact and fuzzy matching
- Add unit tests for matching logic (exact, fuzzy, case-insensitive)
## Deep Link Support (src-tauri/src/deeplink.rs)
- Initialize icon fields when creating Provider from deep link import
## Module Registration (src-tauri/src/lib.rs)
- Register provider_defaults module
## Dependencies (Cargo.toml)
- Add once_cell for lazy static initialization
This backend support enables icon persistence and future features
like auto-icon inference during provider creation.
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