Add blockfrost-gateway to this monorepo

[michalrus]

Context

• As discussed in Slack.

• Much easier to test (and edit!) Platform+Gateway together.

• Part of the Hydra support:

  • Add Hydra micropayments (gateway↔platform) #425
  • Add Hydra micropayments (gateway↔end user) #451

• I have added the initial commit history for… history – but rewritten to remove all secrets.

How to review

Commit 38ecc36 should be equal in contents to the current blockfrost-gateway, i.e. 5bfeb7a:

❯ git diff 38ecc36..5bfeb7a | wc -l
0

Commit 7c4a259 is a pure subtree merge of Gateway into Platform (you can check that):

❯ git show --no-patch 7c4a259
commit 7c4a2593f28bfde5fa3ebd17d5fffc2fc1e9b337
Merge: 64f7fde 38ecc36
Author: Michal Rus <michal.rus@iohk.io>
Date:   Mon Mar 2 08:31:53 2026 +0100

    Add 'crates/gateway/' from commit '38ecc367d542ec7ecf9297d36e3af3261c3dcd98'

    git-subtree-dir: crates/gateway
    git-subtree-mainline: 64f7fde0b7a3bb773e723751a5b22d2ee78a7ec6
    git-subtree-split: 38ecc367d542ec7ecf9297d36e3af3261c3dcd98

Therefore you only need to review changes between 7c4a259 and the HEAD of this PR:

❯ git diff 7c4a259..pull/464/head

Or in GitHub UI: https://github.com/blockfrost/blockfrost-platform/compare/7c4a2593f28bfde5fa3ebd17d5fffc2fc1e9b337..pull/464/head

[cloudflare-workers-and-pages]

Deploying blockfrost-platform with    Cloudflare Pages

Latest commit:	efa5ad5
Status:	✅  Deploy successful!
Preview URL:	https://ebb16c04.blockfrost-platform.pages.dev
Branch Preview URL:	https://chore-monorepo-gateway.blockfrost-platform.pages.dev

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