feat: 优化扫描性能，防止睡死

internal/scanner/scanner.go

@@ -49,6 +49,7 @@ func (s *Scanner) scanLoop() {
 
 func (s *Scanner) performScan() {
 	log.Println("[扫描器] 开始新一轮全盘扫描")
+	fileCount := 0
 
 	for _, root := range s.scanPaths {
 		err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
@@ -60,10 +61,15 @@ func (s *Scanner) performScan() {
 			}
 
 			if err != nil {
+				log.Printf("[扫描器] 访问错误: %v", err)
 				return nil
 			}
 
-			s.checkCPUAndSleep()
+			fileCount++
+
+			if fileCount%100 == 0 {
+				s.checkCPUAndSleep()
+			}
 
 			if info.IsDir() {
 				if s.wlManager.IsPathIgnored(path) {
@@ -96,7 +102,7 @@ func (s *Scanner) performScan() {
 }
 
 func (s *Scanner) checkCPUAndSleep() {
-	percent, err := cpu.Percent(time.Second, false)
+	percent, err := cpu.Percent(200*time.Millisecond, false)
 	if err != nil || len(percent) == 0 {
 		log.Printf("[扫描器] 获取CPU使用率失败: %v", err)
 		return