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/api/inbound.ts

@@ -1,6 +1,6 @@
 import { z } from 'zod';
 
-import { PortSchema, SniffingSchema } from '@/schemas/primitives';
+import { InboundPortSchema, SniffingSchema } from '@/schemas/primitives';
 import { InboundSettingsSchema } from '@/schemas/protocols/inbound';
 import { SecuritySettingsSchema } from '@/schemas/protocols/security';
 import { NetworkSettingsSchema, StreamExtrasSchema } from '@/schemas/protocols/stream';
@@ -32,7 +32,7 @@ export const InboundCoreSchema = z.object({
   enable: z.boolean().default(true),
   expiryTime: z.number().int().default(0),
   listen: z.string().default(''),
-  port: PortSchema,
+  port: InboundPortSchema,
   tag: z.string().default(''),
   sniffing: SniffingSchema.default({
     enabled: false,