Add domain-drop-watcher-template

[oitray]

Summary

Add Domain Drop Watcher — a self-hosted domain expiry & drop-catching alerter that runs entirely on the Cloudflare Workers free tier (Workers + D1 + KV + Cron Triggers).

• Single Worker, zero external dependencies
• Monitors domains via RDAP (no WHOIS, no API keys needed)
• Alerts via Slack webhook, generic webhook, or email (Mailchannels)
• Magic-link + passkey auth, optional demo/guest mode
• Budget gauge tracks D1 reads/writes against free-tier limits

Source: https://github.com/oitray/domain-drop-watcher (MIT)

Test plan

• npx wrangler dev starts locally
• Deploy via "Deploy with Workers" button creates working instance
• Dashboard loads, login flow works, domain monitoring returns RDAP data
• pnpm fix:lockfiles passes

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