fix(sockopt): rename interfaceName to interface so xray honors it

xray-core reads the bind-interface sockopt as json:"interface", but the schema and forms used interfaceName. Go's JSON unmarshal is case-insensitive, yet interfacename != interface, so the value never reached xray and interface binding silently did nothing. Rename the field across the schema, the inbound/outbound forms, and the golden fixture to match xray-core and the official docs.

frontend/src/pages/inbounds/form/transport/sockopt.tsx

@@ -130,7 +130,7 @@ export default function SockoptForm({
                   <Input />
                 </Form.Item>
                 <Form.Item
-                  name={['streamSettings', 'sockopt', 'interfaceName']}
+                  name={['streamSettings', 'sockopt', 'interface']}
                   label={t('pages.inbounds.info.interfaceName')}
                 >
                   <Input />

frontend/src/pages/xray/outbounds/transport/sockopt.tsx

@@ -89,7 +89,7 @@ export default function SockoptForm({ form }: { form: FormInstance<OutboundFormV
                 </Form.Item>
                 <Form.Item
                   label={t('pages.xray.outboundForm.interface')}
-                  name={['streamSettings', 'sockopt', 'interfaceName']}
+                  name={['streamSettings', 'sockopt', 'interface']}
                 >
                   <Input />
                 </Form.Item>