Route all LLM traffic through `cloud.zed.dev` (#34404)

This PR makes it so all LLM traffic is routed through `cloud.zed.dev`.

We're already routing `llm.zed.dev` to `cloud.zed.dev` on the server,
but we want to standardize on `cloud.zed.dev` moving forward.

Release Notes:

- N/A
eca36c502eMarshall Bowers committed on 7/14/2025, 4:03:19 PM· committed by GitHubparent6673c7c
8 files changedLine totals unavailable