The `port` field should not be allowed to be set to non-int values, as this would break some downstream assumptions that the option is an int.
This reverts commit 1b1f95aa9c.
The DNS resolution of the overall UDP part has been delayed to the connection initiation stage. During the rule matching process, it will only be triggered when the IP rule without no-resolve is matched.
For direct and wireguard outbound, the same logic as the TCP part will be followed, that is, when direct-nameserver (or DNS configured by wireguard) exists, the result of the matching process will be discarded and the domain name will be re-resolved. This re-resolution logic is only effective for fakeip.
For reject and DNS outbound, no resolution is required.
For other outbound, resolution will still be performed when the connection is initiated, and the domain name will not be sent directly to the remote server at present.
