feat: complete cmpp platform phases 0-5

gateway/internal/health/server.go

@@ -0,0 +1,26 @@
+package health
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+)
+
+type Status struct {
+	Status    string `json:"status"`
+	Service   string `json:"service"`
+	Timestamp string `json:"timestamp"`
+}
+
+func Handler() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(Status{
+			Status:    "ok",
+			Service:   "cmpp-gateway",
+			Timestamp: time.Now().UTC().Format(time.RFC3339Nano),
+		})
+	})
+	return mux
+}