✨ Add badges

- Implement tests for existing user badge SVG retrieval. - Ensure placeholder SVG is returned for non-existent users. - Verify case-insensitive username lookup for badges. - Test badge filtering by domain to return correct deployment messages. - Check response for unknown domains with no deployments. - Validate status tiers based on deployment recency. :art: Revise README for clarity and conciseness Streamline content and enhance API usage examples for better understanding. :sparkles: Enhance API response structure and tests Improve error handling in API responses and update tests to validate new response formats and status codes. :art: Refine AI coding agent guide structure Enhance organization and clarity of the guide for better usability.