docs: set qwen as default provider with coder-model

- Mark Qwen OAuth as recommended default provider
- Update model reference to coder-model (qwen3-coder-plus)
- Add default provider setup instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/claw-setup/README.md

@@ -120,8 +120,9 @@
 | **Requests/day** | 2,000 |
 | **Requests/minute** | 60 |
 | **Cost** | **FREE** |
-| **Model** | Qwen3-Coder (coding-optimized) |
+| **Model** | `coder-model` (qwen3-coder-plus) |
 | **Auth** | Browser OAuth via qwen.ai |
+| **Default** | ✅ Recommended default provider |
 
 ### Quick Start