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/pages/inbounds/form/InboundFormModal.tsx

@@ -161,6 +161,8 @@ export default function InboundFormModal({
   const streamEnabled = canEnableStream({ protocol });
 
   const wPort = Form.useWatch('port', form);
+  const wListen = (Form.useWatch('listen', form) ?? '') as string;
+  const isUdsListen = wListen.startsWith('/');
   const wNodeId = Form.useWatch('nodeId', form) ?? null;
   const wTag = Form.useWatch('tag', form) ?? '';
   const wSsNetwork = Form.useWatch(['settings', 'network'], form);
@@ -488,7 +490,7 @@ export default function InboundFormModal({
         label={t('pages.inbounds.port')}
         rules={[antdRule(InboundFormBaseSchema.shape.port, t)]}
       >
-        <InputNumber min={1} max={65535} />
+        <InputNumber min={isUdsListen ? 0 : 1} max={65535} />
       </Form.Item>
 
       <Form.Item