Add dependencies and utility scripts for icon system:
## Dependencies (package.json)
- Add @lobehub/icons-static-svg@1.73.0
- High-quality SVG icon library for AI providers
- Source for extracted icons in src/icons/extracted/
- Update pnpm-lock.yaml accordingly
## Provider Preset Updates (src/config/claudeProviderPresets.ts)
- Add optional `icon` and `iconColor` fields to ProviderPreset interface
- Apply to Anthropic Official preset as example:
- icon: "anthropic"
- iconColor: "#D4915D"
- Future presets can include default icon configurations
## Utility Script (scripts/filter-icons.js) [NEW]
- Helper script for filtering and managing icon assets
- Supports icon discovery and validation workflow
- Complements extract-icons.js and generate-icon-index.js
This completes the icon system infrastructure, providing all
necessary tools and dependencies for icon customization.
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