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.

src/config/claudeProviderPresets.ts

@@ -40,6 +40,9 @@ export interface ProviderPreset {
   endpointCandidates?: string[];
   // 新增：视觉主题配置
   theme?: PresetTheme;
+  // 图标配置
+  icon?: string; // 图标名称
+  iconColor?: string; // 图标颜色
 }
 
 export const providerPresets: ProviderPreset[] = [
@@ -56,6 +59,8 @@ export const providerPresets: ProviderPreset[] = [
       backgroundColor: "#D97757",
       textColor: "#FFFFFF",
     },
+    icon: "anthropic",
+    iconColor: "#D4915D",
   },
   {
     name: "DeepSeek",