Change host port to 3001 and add panic recovery to main

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -1,10 +1,8 @@
-version: '3.8'
-
 services:
   docker-manager:
     build: .
     ports:
-      - "3000:3000"
+      - "3001:3000"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
     environment:

main.go

@@ -6,10 +6,19 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"runtime/debug"
 	"strings"
 )
 
 func main() {
+	defer func() {
+		if r := recover(); r != nil {
+			fmt.Fprintf(os.Stderr, "PANIC: %v\n", r)
+			debug.PrintStack()
+			os.Exit(1)
+		}
+	}()
+
 	// Detect Docker socket
 	socketPath := docker.DetectSocket()
 	fmt.Printf("Using Docker socket: %s\n", socketPath)