fix(go): repair migration wire contracts and runtime lifecycle; document incomplete port

internal/web/debug.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"net"
 	"net/http"
 	"time"
 
@@ -40,9 +41,14 @@ func (d *DebugServer) Start() error {
 		Handler: mux,
 	}
 
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		cancel()
+		return err
+	}
 	go func() {
 		log.Printf("[DEBUG-API] Debug WebUI panel at http://%s:5809/", d.cfg.Network.AdvertisedHost)
-		if err := d.httpSrv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		if err := d.httpSrv.Serve(ln); err != nil && err != http.ErrServerClosed {
 			log.Printf("[DEBUG-API] Debug server error: %v", err)
 		}
 	}()