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/eslint.config.mjs

@@ -0,0 +1,45 @@
+import globals from "globals"
+import nextPlugin from "@next/eslint-plugin-next"
+import prettier from "eslint-config-prettier/flat"
+import tseslint from "typescript-eslint"
+
+export default [
+  {
+    ignores: [".next/**", "out/**", "build/**", "next-env.d.ts"],
+  },
+  {
+    files: ["**/*.{js,mjs,cjs,ts,tsx,jsx}"],
+    languageOptions: {
+      ecmaVersion: "latest",
+      sourceType: "module",
+      globals: {
+        ...globals.browser,
+        ...globals.nodeBuiltin,
+      },
+    },
+  },
+  nextPlugin.flatConfig.coreWebVitals,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    rules: {
+      "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          argsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+        },
+      ],
+      "@typescript-eslint/consistent-type-imports": [
+        "error",
+        {
+          prefer: "type-imports",
+        },
+      ],
+      "no-console": ["warn", { allow: ["warn", "error"] }],
+      "prefer-const": "error",
+      "no-var": "error",
+    },
+  },
+]