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/i18n/config.ts

@@ -0,0 +1,5 @@
+export const locales = ["en", "ko", "ja", "zh"] as const
+
+export type Locale = (typeof locales)[number]
+
+export const defaultLocale: Locale = "en"

web/i18n/request.ts

@@ -0,0 +1,16 @@
+import { getRequestConfig } from "next-intl/server"
+import type { Locale } from "./config"
+import { routing } from "./routing"
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  const requested = await requestLocale
+  const locale: Locale =
+    requested && routing.locales.includes(requested as Locale)
+      ? (requested as Locale)
+      : routing.defaultLocale
+
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  }
+})

web/i18n/routing.ts

@@ -0,0 +1,12 @@
+import { defineRouting } from "next-intl/routing"
+import { createNavigation } from "next-intl/navigation"
+import { locales, defaultLocale } from "./config"
+
+export const routing = defineRouting({
+  locales,
+  defaultLocale,
+  localePrefix: "as-needed",
+  localeDetection: true,
+})
+
+export const { Link, redirect, usePathname, useRouter, getPathname } = createNavigation(routing)