fix: preserve product routes during deploy

[steipete]

Summary

Keep product route ownership in scripts/ensure-cloudflare-domains.mjs and let the recurring product Worker deploy update script versions without touching zone routes.

The live routes were corrected by #19, but the regular CI token intentionally lacks zone-route permission, so declaring routes in the deploy config caused workflow run 27392846683 to fail after upload.

Verification

• pnpm check
• pnpm test (45 tests)
• pnpm deploy:product --dry-run
• git diff --check
• external fetch: both crabfleet.ai and www.crabfleet.ai return generic product content
• autoreview clean: no accepted/actionable findings

[chatgpt-codex-connector]

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