ci: publish API docs to GitHub Pages

[Joeloo1]

Summary

This PR sets up automatic publishing of Rust API documentation to GitHub Pages on tagged releases.

Changes

• Added GitHub Actions workflow to build and deploy docs on version tags
• Enhanced Makefile with docs-publish target for CI builds
• Added API documentation link to README
• Included implementation summary document

Features

• Auto-build on tags: Workflow triggers on v* tags
• GitHub Pages deployment: Uses official actions/deploy-pages action
• Proper permissions: OIDC-based authentication
• Index redirect: Root page redirects to main crate docs
• Manual trigger: Supports workflow dispatch for emergency updates

Published URL

https://hypersafed.github.io/Sanctifier/

Impact

• Zero breaking changes
• Minimal maintenance overhead
• Standard rustdoc output
• Accessible from README

Closes #787

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