fix: 修复IMSI数据验证逻辑，确保正确处理前缀和长度

src/modules/network_data/service/udm_auth.go

@@ -49,13 +49,13 @@ func (r *UDMAuthUser) dataByRedis(imsi, neId string) []model.UDMAuthUser {
 	}
 
 	for k, m := range mkv {
-		if k == "-" {
+		if len(k) != 20 {
 			continue
 		}
 
 		// 跳过-号数据 ausf:360000100000130
-		imsi := k[5:]
-		if strings.Contains(imsi, "-") {
+		imsi, hasPrefix := strings.CutPrefix(k, "ausf:")
+		if strings.Contains(imsi, "-") || !hasPrefix {
 			continue
 		}