Legal pages, SEO routes, brand refresh, and custom 404s

Full legal pages with shared LegalLayout — Added complete Terms of Service, Privacy Policy, and Cookie Policy pages (replacing placeholders). All three pages use a shared LegalLayout, include canonical/OG/Twitter metadata, and publish contact details for legal/support (legal@suprlogs.com / support@suprlogs.com).
New BrandLogo component and refreshed wordmark — Introduced a single BrandLogo component that renders the acid‑green "S" block and the wordmark with a pink→purple gradient on “Logs”. The new component replaced duplicated logo markup in the header, footer, and sidebar for a consistent brand across the site.
SEO routes (global + per‑project) and llms.txt — Added global robots, sitemap and llms.txt routes plus visibility‑aware project‑scoped robots.txt, sitemap.xml, and llms.txt under changelog/[slug]. Project routes respect public/private/unlisted visibility and are served via the subdomain rewrite so hosted changelogs expose correct SEO files.
Custom 404s and marketing homepage refresh — Added branded global and changelog‑scoped 404 pages. Updated the marketing homepage with a marquee strip, two‑column hero (gradient headline), mock project feed, a stats strip, three‑step pipeline, and social‑proof audience cards.

Added full Terms, Privacy, and Cookie Policy pages with verbose legal text and shared LegalLayout.frontend
Added BrandLogo component to centralize site logo and gradient wordmark.frontend
Added global robots, sitemap, and llms.txt routes to the marketing site.backend
Added per‑project (changelog/[slug]) robots.txt, sitemap.xml, and llms.txt that return non‑indexable responses for private/unlisted projects.backend
Added project‑scoped 404 page for changelog subdomains and a branded global 404 page.frontend

Refreshed marketing homepage with marquee, two‑column hero, mock feed, stats strip, pipeline steps, and social‑proof cards.frontend
Replaced duplicated inline logo markup in header, footer, and sidebar with the new BrandLogo component for consistent styling.frontend
Added Cookies link to the footer next to Terms and Privacy.frontend
Added noindex / nofollow robots metadata to /app, /sign-in, and /sign-up layouts to exclude auth and dashboard routes from search indexing.auth
Removed a duplicate manual <link rel="canonical"> from the changelog entry page in favor of metadata-driven canonical links.frontend
Added /cookie-policy and /llms.txt to the public route matcher so these pages bypass auth checks.auth

Published complete legal copy adapted from SuprKeywords and added canonical/Og/Twitter metadata for Terms, Privacy, and Cookie Policy.frontend