feat: scaffold go vehicle gateway core

go/vehicle-gateway/cmd/gateway/main.go

@@ -0,0 +1,8 @@
+package main
+
+import "lingniu-vehicle-ingest/go/vehicle-gateway/internal/observability"
+
+func main() {
+	logger := observability.NewLogger("vehicle-gateway")
+	logger.Info("vehicle gateway scaffold started")
+}