[WIP] External middleware in cloudflare

[conico974]

The goal of this PR is to deploy the routing/middleware layer in its own worker.
This should make cold start for ISR/SSG route that has been generated before really fast compared to now

[changeset-bot]

⚠️ No Changeset found

Latest commit: d28ff61

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://5414d0dc.gitbook-open.pages.dev	✅
PR	https://pr3254.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-3wybgtfs5-gitbook.vercel.app	✅
Cloudflare	https://668002e4-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://5414d0dc.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-3wybgtfs5-gitbook.vercel.app/url/gitbook.com/docs	https://668002e4-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://5414d0dc.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-3wybgtfs5-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://668002e4-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	May 23, 2025, 4:55 PM
customers-v2 (Inspect)	⚠️ Changes detected (Review)	80 changed	May 23, 2025, 4:56 PM
default (Inspect)	✅ No changes detected	-	May 23, 2025, 4:59 PM
v2-vercel (Inspect)	✅ No changes detected	-	May 23, 2025, 4:59 PM