codeSplitters: move to a custom domain, then account email and the Cloudflare protections #740

Account email and the zone-level protections both need a domain of our own instead of workers.dev. An agent can do the domain move PR (route, BETTER_AUTH_URL, OAuth callbacks); the dashboard steps after it are the owner's.

One agent can take this whole bundle. The original issues are closed into it and keep their full details.

• MANUAL RUN: Cloudflare protections that need a custom domain for codeSplitters (WAF, bots, auth rate limit, Access, security alert) #722 MANUAL RUN: Cloudflare protections that need a custom domain for codeSplitters (WAF, bots, auth rate limit, Access, security alert)
• codeSplitters: turn on account email live (onboard a sender domain) #276 codeSplitters: turn on account email live (onboard a sender domain)

Order: Domain PR first. The rest needs the owner's release and dashboard.

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