fix(inbounds): allow port 0 for UDS inbounds (#4783)

Unix Domain Socket inbounds (listen path starting with /) use port 0, which xray-core ignores. Validation was hard-locked to a minimum of 1 in three places: the shared Zod PortSchema, the AntD InputNumber, and the Go Inbound model tag. Adds an InboundPortSchema (min 0) for the inbound form/API schemas, makes the port InputNumber min UDS-aware, and relaxes the Inbound model validate tag to gte=0. PortSchema and the Node model stay min 1.

frontend/src/schemas/primitives/port.ts

@@ -2,3 +2,6 @@ import { z } from 'zod';
 
 export const PortSchema = z.number().int().min(1).max(65535);
 export type Port = z.infer<typeof PortSchema>;
+
+export const InboundPortSchema = z.number().int().min(0).max(65535);
+export type InboundPort = z.infer<typeof InboundPortSchema>;