api: rename MintActorJWTRequest.audience to plural audiences #2408

Background

In pkg/proto/ateapipb/ateapi.proto, MintActorJWTRequest (ateapi.proto:1716) defines a repeated field using a singular noun:

message MintActorJWTRequest {
  ObjectRef actor = 5;

  // The audiences the minted JWT is bound to. Tokens are only issued with
  // audience bindings, so at least one is required.
  repeated string audience = 1;

  int64 expiration_seconds = 8;
}

This violates docs/api-style-guide.md §5 ("Repeated fields must use the plural noun form") and is inconsistent with ActorJWTSource (ateapi.proto:680), which names the same repeated field audiences:

message ActorJWTSource {
  repeated string audiences = 1;
  int64 expiration_seconds = 2;
}

Proposed Changes

1. pkg/proto/ateapipb/ateapi.proto:
   • Rename MintActorJWTRequest.audience -> audiences.
2. Regenerate & update callers:
   • Run hack/update/codegen.sh to regenerate pkg/proto/ateapipb/ateapi.pb.go and declarative validation in cmd/ateapi/internal/apivalidation.
   • Update callers and tests in cmd/ateapi/, cmd/atenet/internal/router/egress/actorjwt/, and docs/.

Taahir Ahmed (@ahmedtd)