fix(discovery): support Chinese ping output and decode GBK

- parsePingReply now matches both 'received =' (English) and 'received =' (Chinese) so devices are detected correctly on non-English Windows

- decode ping stdout from GBK to UTF-8

- remove raw ping log output

- add golang.org/x/text dependency

auto-check/pkg/discovery/scanner.go

@@ -3,6 +3,7 @@ package discovery
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
 	"os/exec"
 	"strings"
@@ -10,6 +11,8 @@ import (
 	"time"
 
 	"auto-check/pkg/model"
+	"golang.org/x/text/encoding/simplifiedchinese"
+	"golang.org/x/text/transform"
 )
 
 // Scanner 网段扫描器（并发 ping 探测）
@@ -103,29 +106,43 @@ func (s *Scanner) ping(ip string) bool {
 	cmd := exec.CommandContext(ctx, "ping", "-n", "1", "-w", fmt.Sprintf("%d", pingWait), ip)
 	out, err := cmd.Output()
 	if err != nil {
+		fmt.Printf("  [-] %s ping err=%v\n", ip, err)
 		return false
 	}
-	return parsePingReply(string(out))
+	// Windows 下 ping 输出为 GBK 编码，解码为 UTF-8 后再解析
+	text := decodeGBK(out)
+	return parsePingReply(text)
 }
 
-// parsePingReply 判断 ping 输出是否表示存活
+// parsePingReply 判断 ping 输出是否表示存活。
+// 兼容中英文 Windows 输出：英文 "Received = 1" / 中文 "已接收 = 1"。
+// 匹配接收数关键字后取其后数字，>=1 即视为存活。
 func parsePingReply(out string) bool {
 	for _, line := range strings.Split(out, "\n") {
 		l := strings.ToLower(strings.TrimSpace(line))
-		// Windows: "Packets: Sent = 1, Received = 1, Lost = 0"
-		if strings.Contains(l, "received =") {
-			i := strings.Index(l, "received =")
-			n := strings.TrimSpace(l[i+len("received ="):])
-			// 取数字前缀
-			cnt := 0
-			for _, c := range n {
-				if c < '0' || c > '9' {
-					break
-				}
-				cnt = cnt*10 + int(c-'0')
-			}
-			return cnt >= 1
+		// 提取关键字后的接收数，定位到 '=' 之后
+		kw := "received ="
+		idx := strings.Index(l, kw)
+		if idx < 0 {
+			kw = "已接收 ="
+			idx = strings.Index(l, kw)
 		}
+		if idx < 0 {
+			continue
+		}
+		eq := strings.Index(l[idx:], "=")
+		if eq < 0 {
+			continue
+		}
+		n := strings.TrimSpace(l[idx+eq+1:])
+		cnt := 0
+		for _, c := range n {
+			if c < '0' || c > '9' {
+				break
+			}
+			cnt = cnt*10 + int(c-'0')
+		}
+		return cnt >= 1
 	}
 	return false
 }
@@ -139,3 +156,14 @@ func inc(ip net.IP) {
 		}
 	}
 }
+
+// decodeGBK 将 GBK 编码字节转为 UTF-8 字符串（Windows ping 输出为 GBK）。
+// 若解码失败则原样返回。
+func decodeGBK(b []byte) string {
+	r := transform.NewReader(strings.NewReader(string(b)), simplifiedchinese.GBK.NewDecoder())
+	out, err := io.ReadAll(r)
+	if err != nil {
+		return string(b)
+	}
+	return string(out)
+}