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

internal/web/admin.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"html/template"
 	"log"
+	"net"
 	"net/http"
 	"sync"
 	"time"
@@ -43,15 +44,24 @@ func (a *AdminServer) Start() error {
 	mux.HandleFunc("/api/command", a.handleCommand)
 	mux.HandleFunc("/api/sessions", a.handleSessions)
 
-	addr := fmt.Sprintf("%s:%d", a.cfg.Network.BindHost, a.cfg.Admin.Port)
+	host := a.cfg.Admin.Host
+	if host == "" {
+		host = "127.0.0.1"
+	}
+	addr := net.JoinHostPort(host, fmt.Sprint(a.cfg.Admin.Port))
 	a.httpSrv = &http.Server{
 		Addr:    addr,
 		Handler: mux,
 	}
 
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		cancel()
+		return err
+	}
 	go func() {
 		log.Printf("[ADMIN-GM] Admin Web Panel running at http://%s:%d/", a.cfg.Network.AdvertisedHost, a.cfg.Admin.Port)
-		if err := a.httpSrv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		if err := a.httpSrv.Serve(ln); err != nil && err != http.ErrServerClosed {
 			log.Printf("[ADMIN-GM] Web server error: %v", err)
 		}
 	}()