feat(icons): add PackyCode provider icon support

Add PackyCode as a supported AI provider icon with proper metadata
and filtering configuration.

Changes:
- Add 'packycode' to icon filter whitelist in filter-icons.js
- Register PackyCode metadata with display name, category, and keywords
- Import PackyCode SVG icon file
- Export icon through index.ts for use in provider configurations

The PackyCode icon uses currentColor to adapt to theme styling.

scripts/filter-icons.js

@@ -14,6 +14,7 @@ const KEEP_LIST = [
     'zhipu', 'chatglm', 'glm', 'minimax', 'mistral', 'cohere',
     'perplexity', 'huggingface', 'midjourney', 'stability',
     'xai', 'grok', 'yi', 'zeroone', 'ollama',
+    'packycode',
 
     // Cloud/Tools
     'aws', 'googlecloud', 'huawei', 'cloudflare',