chore(web): migrate canonical domain to omo.dev

Switch the production worker route and all hardcoded URLs from
ohmyopenagent.com to omo.dev. Six legacy domains (ohmyopenagent.com,
ohmyopencode.org, ulw.dev, ultrawork.ai, ultrawork.dev,
ultrawork.engineer) are configured to permanently (301) redirect to
omo.dev via Cloudflare Page Rules set up out-of-band via flarectl
and the CF API.

- wrangler.toml: bind worker to omo.dev + www.omo.dev only
- middleware.ts: primaryHost to omo.dev, www to apex redirect retained
- layout.tsx: primarySiteUrl + gaTrackedDomain to omo.dev (GA still G-S0QJFKT46Q)
- sitemap.ts, robots.ts: BASE_URL to https://omo.dev
- npm-downloads/route.ts: usage comment URL refreshed
- web-deploy.yml: environment URL to https://omo.dev
- manifesto.md: domain reality-check line lists omo.dev as canonical
- README*.md (5 langs): npm-downloads badge endpoint to omo.dev

.github/workflows/web-deploy.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     environment:
       name: web-production
-      url: https://ohmyopenagent.com
+      url: https://omo.dev
     defaults:
       run:
         working-directory: packages/web