Add obsx library

doc.go

@@ -0,0 +1,17 @@
+// Package obsx provides observability setup for the platform: metrics (Prometheus)
+// and tracing (OpenTelemetry).
+//
+// # Quick Start
+//
+//	// Tracing
+//	shutdown, err := obsx.SetupTracer(ctx, obsx.TracerConfig{
+//	    ServiceName: "my-service",
+//	    Endpoint:    "localhost:4317",
+//	})
+//	defer shutdown(ctx)
+//
+//	// Metrics
+//	metrics := obsx.NewMetrics(obsx.MetricsConfig{Namespace: "myapp"})
+//	reqCounter := metrics.Counter("requests_total", "Total requests", "method", "status")
+//	http.Handle("/metrics", metrics.Handler())
+package obsx