fix disabled pprof server handling

backend/cmd/main.go

@@ -78,7 +78,9 @@ func main() {
 	if err != nil {
 		log.Printf("Failed to start API pprof server: %v", err)
 	}
+	if pprofServer != nil {
 		defer pprofServer.Close()
+	}
 
 	// 设置路由
 	r := apphttp.SetRouter(sqlDB, cache, rmq)

backend/cmd/worker/main.go

@@ -132,7 +132,9 @@ func main() {
 	if err != nil {
 		log.Printf("Failed to start worker pprof server: %v", err)
 	}
+	if pprofServer != nil {
 		defer pprofServer.Close()
+	}
 
 	errCh := make(chan error, 4)
 	log.Printf("Worker started, consuming queue=%s", socialQueue)

backend/internal/observability/pprof.go

@@ -9,7 +9,6 @@ import (
 	"net/http"
 	"net/http/pprof"
 	"time"
-
 )
 
 type PprofServer struct {
@@ -17,6 +16,7 @@ type PprofServer struct {
 	server          *http.Server
 	shutdownTimeout time.Duration
 }
+
 func NewPprofMux() *http.ServeMux {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/debug/pprof/", pprof.Index)
@@ -29,17 +29,17 @@ func NewPprofMux() *http.ServeMux {
 }
 
 func NewPprofServer(name string, enabled bool, addr string) (*PprofServer, error) {
-	pprofServer := &PprofServer{
-		name: name,
-		shutdownTimeout: 3 * time.Second,
-	}
 	if !enabled || addr == "" {
-		return pprofServer, nil
+		return nil, nil
 	}
 	ln, err := net.Listen("tcp", addr)
 	if err != nil {
 		return nil, fmt.Errorf("failed to start %s pprof server on %s: %w", name, addr, err)
 	}
+	pprofServer := &PprofServer{
+		name:            name,
+		shutdownTimeout: 3 * time.Second,
+	}
 	pprofServer.server = &http.Server{
 		Addr:              addr,
 		Handler:           NewPprofMux(),
@@ -65,7 +65,7 @@ func (s *PprofServer) Close() error {
 	if s == nil {
 		return nil
 	}
-	shutdownCtx, cancel := context.WithTimeout(context.Background(), 3 * time.Second)
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), s.shutdownTimeout)
 	defer cancel()
 	if err := Shutdown(shutdownCtx, s.server); err != nil {
 		log.Printf("Failed to shutdown %s pprof server: %v", s.name, err)