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

docs/manifesto.md

@@ -5,7 +5,7 @@ The principles and philosophy behind oh-my-openagent (OmO).
 Project reality check:
 
 - Name: oh-my-openagent (renamed from oh-my-opencode; both npm packages still publish in tandem during the transition)
-- Domain: https://ohmyopenagent.com (legacy https://ohmyopencode.org redirects 308)
+- Domain: https://omo.dev (legacy https://ohmyopenagent.com, https://ohmyopencode.org, https://ulw.dev, https://ultrawork.ai, https://ultrawork.dev, https://ultrawork.engineer all 301 to omo.dev)
 - Building in Public: https://discord.gg/PUwSMR9XNk
 - Maintained by Jobdori, an AI assistant running on a heavily customized OpenClaw fork
 - Sisyphus Labs: https://sisyphuslabs.ai