Hashavatar API 0.12.0

hashavatar-api v0.12.0

This release updates the API and demo site for hashavatar 0.12.0.

Changed

• Uses the published hashavatar 0.12.0 crate.
• Demo/API avatar rendering is now SHA-512 only.
• Demo/API avatar responses are now WebP only.
• Removed algorithm and format selectors from the demo UI.
• Updated OpenAPI, README, security docs, and smoke tests for the stricter 0.12.0 behavior.
• Updated CSP script hash for the revised demo page.

Security and Reliability

• Keeps the recent hardening around rate limiting, metrics access, security headers, generic error responses, and health check disclosure.
• Local checks, smoke tests, dependency policy, RustSec audit, and GitHub checks passed before tagging.