Add local monitor bridge service

cmd/harborforge-monitor/main.go

@@ -12,6 +12,7 @@ import (
 	"syscall"
 	"time"
 
+	"git.hangman-lab.top/zhi/HarborForge.Monitor/internal/bridge"
 	"git.hangman-lab.top/zhi/HarborForge.Monitor/internal/config"
 	"git.hangman-lab.top/zhi/HarborForge.Monitor/internal/telemetry"
 )
@@ -50,11 +51,30 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
 
+	// Start the bridge server if MONITOR_PORT is configured.
+	// The bridge is independent of heartbeat — if it fails to start,
+	// heartbeat continues normally.
+	var bridgeSrv *bridge.Server
+	if cfg.MonitorPort > 0 {
+		bridgeSrv = bridge.New(cfg, logger)
+		go func() {
+			if err := bridgeSrv.Start(ctx); err != nil {
+				logger.Printf("bridge error (non-fatal): %v", err)
+			}
+		}()
+	}
+
 	sendOnce := func() error {
 		payload, err := telemetry.BuildPayload(ctx, cfg)
 		if err != nil {
 			return err
 		}
+
+		// Update bridge with latest telemetry
+		if bridgeSrv != nil {
+			bridgeSrv.UpdatePayload(payload)
+		}
+
 		if printPayload || dryRun {
 			buf, _ := json.MarshalIndent(payload, "", "  ")
 			fmt.Println(string(buf))