feat(brand): chemistry rebrand across panel + marketing

The logged-in panel is now Catalyst Console (by Corrosion); the marketing site
keeps Corrosion as the platform/company and introduces the lexicon.

- Wordmark: panel/auth Logo lockup -> 'Catalyst' / 'by Corrosion'; the shared
  C-core house mark (CorrosionMark) is untouched. Marketing nav/footer keep the
  'Corrosion' wordmark.
- Titles: panel routes -> '{View} · Catalyst'; auth -> Catalyst; document.title
  fallback + index.html -> 'Catalyst Console'. Marketing titles stay '— Corrosion'.
- Host agent user-facing copy -> 're-Agent' across panel + marketing (the
  binary filename / CDN URLs / config paths / domains are UNCHANGED — that's the
  separate infra/binary-rename sprint; 'Download re-Agent' fetching
  corrosion-host-agent-* is the intended intermediate state).
- Deploy-recipe 'blueprint/template' -> 'Formula/Formulae' in marketing + roadmap;
  Rust in-game 'blueprint wipe' kept (game term).
- docs/BRANDING.md added (Oracle review + locked lexicon).

vue-tsc + vite green; rendered clean both faces (Catalyst panel / Corrosion
marketing), 0 console errors.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/index.html

@@ -8,7 +8,7 @@
     <link rel="apple-touch-icon" href="/favicon.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="theme-color" content="#0a0a0a" />
-    <title>Corrosion Management</title>
+    <title>Catalyst Console</title>
     <meta name="description" content="Management panel for self-hosted survival game servers — Rust, Dune: Awakening, Conan Exiles, Soulmask. Wipe automation, plugins, monitoring. Bring your own server." />
     <meta property="og:title" content="Corrosion — Game Server Operations for Self-Hosted Communities" />
     <meta property="og:description" content="Management panel for self-hosted survival game servers — Rust, Dune: Awakening, Conan Exiles, Soulmask. Wipe automation, plugins, monitoring. Bring your own server." />