[studio] beta studio (#114)

* rrs stuff

* studio service yay

* rrs whitelist

* moree studiooooooo fellowwww

* rec room studio room loading yay

* fixes yay

* fix 2 because idk  yayuh

* Update cdn.app.ts

* ccontent length fix?

* Preserve content-length and upgrade metadata

Return a real zero-filled byte array for CDN HEAD responses so the runtime preserves Content-Length while still sending no payload. In notify, re-create the Request with its original headers, set OWNER_HEADER from the validated token, and forward that Request to hub.fetch to avoid losing WebSocket upgrade metadata (which could trigger 500s in Durable Objects). These changes ensure the editor's size checks and WebSocket upgrades remain reliable.

* fix x524234

* shirt thing?

* [auth] remove grant table as we already have audit_log for now

* rename table to generic device_grant

* cleanup/lint

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Co-authored-by: Devin Zuczek <devin.zuczek@gmail.com>

apps/rooms/README.md

@@ -36,6 +36,10 @@ Reads are the exception: they carry no envelope at all. A paged read (the save h
 `…/subrooms/{subRoomId}/saves` and its lighter `…/saves/no_unity_assets` twin) is a bare
 `{ Results, TotalResults, TotalCount }` wrapper — `TotalResults` and `TotalCount` are the
 same number, because the client's paged DTO and the reference disagree on the name.
+`GET /rooms/{roomId}` puts a Studio build's main bundles on `CurrentSave.UnitySubAssets`
+(target 0 Windows, 2 Android/Quest). `unityAssetTarget` keeps only that target. Maker-pen
+saves keep the arrays empty. `GET …/unityasset?unityAssetId=` is the bare metadata for
+those files; the bytes are on the CDN.
 
 ## Cron