feat: complete wgcloak v1 transports

examples/server.minimal.toml

@@ -7,6 +7,10 @@ listen = "0.0.0.0"
 [backend]
 target = "127.0.0.1:51820"
 
+[network]
+# Default application payload; configurable up to the 16384-byte safety ceiling.
+max_datagram_size = 1200
+
 # Direct UDP only. Other transports can be enabled explicitly when needed.
 [transports.direct_udp]
 enabled = true