Add ntp protocol sniffing

docs/configuration/route/sniff.md

@@ -22,6 +22,7 @@ If enabled in the inbound, the protocol and domain name (if present) of by the c
 |   UDP   |    `dtls`    |      /      |        /         |
 |   TCP   |    `ssh`     |      /      | SSH Client Name  |
 |   TCP   |    `rdp`     |      /      |        /         |
+|   UDP   |    `ntp`     |      /      |        /         |
 
 |       QUIC Client        |    Type    |
 |:------------------------:|:----------:|

docs/configuration/route/sniff.zh.md

@@ -22,6 +22,7 @@
 |   UDP   |    `dtls`    |      /      |     /      |
 |   TCP   |    `ssh`     |      /      | SSH 客户端名称  |
 |   TCP   |    `rdp`     |      /      |     /      |
+|   UDP   |    `ntp`     |      /      |     /      |
 
 |         QUIC 客户端         |     类型     |
 |:------------------------:|:----------:|