feat(web): import oh-my-openagent-web Next.js + Cloudflare Workers site

Imports the public marketing site previously living in
../oh-my-opencode-web. Independent of the npm plugin: own package.json,
bun.lock, tsconfig.json. Not included in the published package — root
files: array still only ships dist/, bin/, postinstall.mjs.

Stack:
- Next.js 15.5 App Router + RSC, deployed to Cloudflare Workers via
  @opennextjs/cloudflare (build target .open-next/worker.js).
- Tailwind v4 + shadcn/ui primitives.
- next-intl with 4 locales (en/ja/ko/zh) under app/[locale]/.
- Playwright e2e tests under web/e2e/.
- Custom domains ohmyopenagent.com (primary) and ohmyopencode.org
  (legacy alias) declared in web/wrangler.toml.

Source files were re-formatted via `bun run format` to bring them in
line with the existing .prettierrc (singleQuote: false). Functional code
unchanged.

web/.prettierignore

@@ -0,0 +1,31 @@
+# Dependencies
+node_modules
+.pnp
+.pnp.*
+
+# Build output
+.next
+out
+build
+dist
+
+# Testing
+coverage
+test-results
+playwright-report
+.playwright
+
+# Misc
+.DS_Store
+*.pem
+
+# Logs
+*.log
+
+# Lock files
+package-lock.json
+yarn.lock
+pnpm-lock.yaml
+
+# TypeScript
+*.tsbuildinfo