Add health check endpoints (/health and /ready) for container orchestration liveness and readiness probes. (#104)

* added health endpoint

* formatted files

---------

Co-authored-by: lxowalle <83055338+lxowalle@users.noreply.github.com>

cmd/picoclaw/main.go

@@ -13,6 +13,7 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
+	"net/http"
 	"os"
 	"os/signal"
 	"path/filepath"
@@ -28,6 +29,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/cron"
 	"github.com/sipeed/picoclaw/pkg/devices"
+	"github.com/sipeed/picoclaw/pkg/health"
 	"github.com/sipeed/picoclaw/pkg/heartbeat"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/migrate"
@@ -658,6 +660,14 @@ func gatewayCmd() {
 		fmt.Printf("Error starting channels: %v\n", err)
 	}
 
+	healthServer := health.NewServer(cfg.Gateway.Host, cfg.Gateway.Port)
+	go func() {
+		if err := healthServer.Start(); err != nil && err != http.ErrServerClosed {
+			logger.ErrorCF("health", "Health server error", map[string]interface{}{"error": err.Error()})
+		}
+	}()
+	fmt.Printf("✓ Health endpoints available at http://%s:%d/health and /ready\n", cfg.Gateway.Host, cfg.Gateway.Port)
+
 	go agentLoop.Run(ctx)
 
 	sigChan := make(chan os.Signal, 1)
@@ -666,6 +676,7 @@ func gatewayCmd() {
 
 	fmt.Println("\nShutting down...")
 	cancel()
+	healthServer.Stop(context.Background())
 	deviceService.Stop()
 	heartbeatService.Stop()
 	cronService.Stop()