Add OpenRoutiQ to Inference/LLM Router

[debankadas]

Summary

• add OpenRoutiQ to the Inference / LLM Router section
• synchronize the README entry with website/data.yml
• use the landscape repository's existing default.png instead of adding a new logo asset

Validation

• parsed website/data.yml successfully with PyYAML
• verified the LLM Router data remains alphabetically ordered
• verified README/data consistency, a single entry, a live public URL, and git diff --check

Disclosure

I maintain OpenRoutiQ through the antat-ai organization.