chore(deps): add icon library and update preset configurations

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.

package.json

@@ -46,6 +46,7 @@
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@hookform/resolvers": "^5.2.2",
+    "@lobehub/icons-static-svg": "^1.73.0",
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",