Feat: add LLM provider PPIO (#5013)

### What problem does this PR solve?

Add a LLM provider: PPIO

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update

web/src/constants/setting.ts

@@ -56,6 +56,7 @@ export const IconMap = {
   Upstage: 'upstage',
   'novita.ai': 'novita-ai',
   SILICONFLOW: 'siliconflow',
+  'PPIO': 'ppio',
   '01.AI': 'yi',
   Replicate: 'replicate',
   'Tencent Hunyuan': 'hunyuan',