Fix data race in OnTrafficFromServer by cloning resp before channel send

The same v1.Struct pointer was sent to UpdateCacheChannel and returned
to GatewayD via gRPC. The UpdateCache goroutine mutated Fields while
gRPC serialized them concurrently, corrupting responses under load.

Author: mostafa

plugin/plugin.go

@@ -17,6 +17,7 @@ import (
 	goRedis "github.com/redis/go-redis/v9"
 	"github.com/spf13/cast"
 	"google.golang.org/grpc"
+	"google.golang.org/protobuf/proto"
 )
 
 type Plugin struct {
@@ -296,7 +297,7 @@ func (p *Plugin) OnTrafficFromServer(
 	_ context.Context, resp *v1.Struct,
 ) (*v1.Struct, error) {
 	p.Logger.Debug("Traffic is coming from the server side")
-	p.UpdateCacheChannel <- resp
+	p.UpdateCacheChannel <- proto.Clone(resp).(*v1.Struct)
 	return resp, nil
 }