type(shared): return readonly setups from getProjectHostSetupsForProject

The helper already takes a readonly catalog and returns a filter subset.
Mark the return readonly so callers cannot mutate a live setups array.

Co-authored-by: Orca <help@stably.ai>

src/shared/project-host-setup-projection.ts

@@ -298,7 +298,7 @@ export function projectHostSetupProjectionFromRepos(
 export function getProjectHostSetupsForProject(
   setups: readonly ProjectHostSetup[],
   projectId: string
-): ProjectHostSetup[] {
+): readonly ProjectHostSetup[] {
   return setups.filter((setup) => setup.projectId === projectId)
 }