feat(web,server): external domain setting (#6146)

* feat: external domain setting

* chore: open api

* mobile: handle serverconfig-externalDomain

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

server/src/domain/system-config/system-config.service.spec.ts

@@ -100,6 +100,9 @@ const updatedConfig = Object.freeze<SystemConfig>({
   passwordLogin: {
     enabled: true,
   },
+  server: {
+    externalDomain: '',
+  },
   storageTemplate: {
     enabled: false,
     hashVerificationEnabled: true,