fix: macOS bcopy conflict and Docker host binding

- Fix #11: Guard bcopy/bzero declarations with _VISUALCPP in commoninclude.h
  to avoid redefinition errors on macOS where <strings.h> provides them
- Fix #12: Add --host flag to serve command, default 127.0.0.1
  Docker now binds to 0.0.0.0 so Colima can reach the server from host
- Also fix truncate() panic when n < 3

serve.go

@@ -24,6 +24,7 @@ var webUI embed.FS
 
 func cmdServe(args []string) {
 	port := 0
+	host := "127.0.0.1"
 	openBrowser := true
 
 	for i := 0; i < len(args); i++ {
@@ -33,6 +34,11 @@ func cmdServe(args []string) {
 				port, _ = strconv.Atoi(args[i+1])
 				i++
 			}
+		case "--host":
+			if i+1 < len(args) {
+				host = args[i+1]
+				i++
+			}
 		case "--no-browser":
 			openBrowser = false
 		}
@@ -52,18 +58,19 @@ func cmdServe(args []string) {
 	mux.HandleFunc("/api/extract", handleAPIExtract)
 	mux.HandleFunc("/api/progress", handleProgress)
 
-	addr := fmt.Sprintf("127.0.0.1:%d", port)
+	addr := fmt.Sprintf("%s:%d", host, port)
 	listener, err := net.Listen("tcp", addr)
 	if err != nil {
 		fatal("listen: %v", err)
 	}
 
 	realPort := listener.Addr().(*net.TCPAddr).Port
+	realHost := listener.Addr().(*net.TCPAddr).IP.String()
 
 	fmt.Printf("\n  AKAI Utils Server\n")
 	fmt.Printf("  =================\n\n")
-	fmt.Printf("  Local:   http://localhost:%d\n", realPort)
-	fmt.Printf("  API:     http://localhost:%d/api/\n", realPort)
+	fmt.Printf("  Local:   http://%s:%d\n", realHost, realPort)
+	fmt.Printf("  API:     http://%s:%d/api/\n", realHost, realPort)
 	fmt.Printf("  Quit:    Ctrl+C\n\n")
 
 	if openBrowser {