Fix: 修正H3C ARP表解析器适配真实输出格式

- 修正标题行匹配: Type: (带冒号)
- 跳过IP address标题行
- 适配真实ARP表格式: IP MAC VLAN Interface Aging Type
- 正确解析MAC到IP映射

internal/device/h3c.go

@@ -199,13 +199,14 @@ func (p *H3CParser) parseARPTable(output string) map[string]string {
 	for _, line := range lines {
 		// 跳过空行和标题行
 		if strings.TrimSpace(line) == "" || 
-		   strings.Contains(line, "Type") ||
-		   strings.Contains(line, "------") {
+		   strings.Contains(line, "Type:") ||
+		   strings.Contains(line, "------") ||
+		   strings.Contains(line, "IP address") {
 			continue
 		}
 
-		// ARP表格式: IP Address      MAC Address      Interface/Vlan
-		// 例: 172.16.12.1      a4bb-6de2-62cd   GE1/0/1
+		// ARP表格式: IP address      MAC address    VLAN/VSI name Interface                Aging Type
+		// 例: 172.16.8.10     743a-2047-38e0 8             GE1/0/47                 1163  D
 		fields := strings.Fields(line)
 		if len(fields) >= 2 {
 			ip := fields[0]