v5.3.0

What's Changed

• Security hardening, refactors & features (audit roadmap) by @daycry in #50
• feat(webauthn): WebAuthn / Passkeys v1 — passwordless login + passkey 2FA by @daycry in #51
• docs: MkDocs Material site on GitHub Pages (modern header/sidebar/content, no ads) by @daycry in #52
• docs: modern landing page (hero + feature cards) by @daycry in #53
• docs: colorize HTTP examples + fix leftover admonition by @daycry in #54
• docs(readme): point documentation links at GitHub Pages by @daycry in #55
• docs: fix PHP syntax highlighting (tag-less snippets) by @daycry in #57
• feat by @daycry in #56

Full Changelog: v5.2.0...v5.3.0