Bypass Start for marketing requests

[RhysSullivan]

What changed

• classify production marketing requests at the Worker entry
• dispatch them through the existing MARKETING service binding before TanStack Start
• preserve signed-in homepage routing, public path behavior, and the /home rewrite
• add request-level regression coverage for cookies, hosts, queries, headers, methods, and bodies

Why

The marketing proxy lived inside TanStack Start middleware. On a cold isolate, a homepage request therefore loaded the 2.56 MB lazy Start server graph before forwarding to the fast marketing Worker. This moves the routing decision ahead of that import, so public pages only pay the small Worker-entry path.

Validation

• bun run typecheck
• bun run lint
• bun run --cwd apps/cloud build
• bun run --cwd apps/cloud test -- src/edge/marketing.test.ts (22 passed)
• production bundle exercised in Miniflare with a real service binding

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Torn down — the PR is closed.