refactor(discovery): use ping for discovery and fill MAC via SSH

auto-check/pkg/config/config.go

@@ -27,8 +27,9 @@ type Config struct {
 
 // ScanConfig 网段扫描
 type ScanConfig struct {
-	CIDR    string        `yaml:"cidr"`
-	Timeout time.Duration `yaml:"timeout"`
+	CIDR        string        `yaml:"cidr"`
+	Timeout     time.Duration `yaml:"timeout"`
+	Concurrency int           `yaml:"concurrency"` // 并发探测数，默认 30
 }
 
 // SSHConfig SSH 认证
@@ -73,8 +74,9 @@ type WorkflowConfig struct {
 func Default() *Config {
 	return &Config{
 		Scan: ScanConfig{
-			CIDR:    "192.168.1.0/24",
-			Timeout: 3 * time.Second,
+			CIDR:        "192.168.1.0/24",
+			Timeout:     3 * time.Second,
+			Concurrency: 30,
 		},
 		SSH: SSHConfig{
 			User: "root",