feat: point SEO image to logo.png

feat: finalize SEO, rate limiting, and use hero.png

feat: update rate limit to 1/2s, custom error message, and SEO PNG placeholder

feat: complete SEO optimization with robots.txt and sitemap

feat: add SEO and social media metadata

feat: Initial release of Redac - PII moderation MVP

Brand: Finalize Redac_Scan identity with Shield logo, custom favicon, and responsive HUD design.

Initial commit: Privacy Gateway with Multi-language PII detection (EN/FR) and Docker support