Feat/web landing refresh (#958)

* feat(web): openclaude landing — runs anywhere, uses anything

A new marketing site for openclaude under web/, plus the minimal root
infrastructure to build, ignore, and gate it without affecting the
published npm package.

Landing page (web/)
- Vite + React 19 with monospace gitlawb typography (sf mono / fira code).
- Hero: pill, two-line wordmark "runs anywhere. / uses anything.",
  copy-to-clipboard install command, github cta.
- Six feature rows in hermes-style "title — sentence" format on hairline
  dividers (any model, real tools, profiles per repo, streaming,
  gateway routing, editor + server modes).
- Install block: same copyable command + three numbered steps.
- One-line footer with brand, version, gitlawb link, and license.
- Light theme is the default with a no-flash bootstrap script and a
  ☀ / ☾ toggle persisted to localStorage.
- New orange terminal-face logo at 36px in the nav.
- Body wash: dual orange radial gradients for warmth on both themes.

Root infra
- web/ excluded from npm publish via .npmignore (belt-and-suspenders
  alongside the existing files whitelist).
- web/ excluded from docker context (.dockerignore).
- web:dev / web:build / web:preview / web:typecheck scripts in
  package.json that delegate via --cwd web (no root deps added).
- web typecheck + build added to the pr-checks workflow.
- web/dist/ and web/*.tsbuildinfo ignored.

Co-Authored-By: OpenClaude <openclaude@gitlawb.com>

* added vercel in .gitignore

---------

Co-authored-by: OpenClaude <openclaude@gitlawb.com>

.gitignore

@@ -1,6 +1,8 @@
 node_modules/
 dist/
 *.tsbuildinfo
+web/dist/
+web/*.tsbuildinfo
 .env
 .env.*
 !.env.example