android: add group channel invite and admin management baseline

docs/android-checklist.md

@@ -74,13 +74,13 @@
 - [x] Единый global audio focus (1 источник звука)
 
 ## 10. Группы/каналы
-- [ ] Create group/channel
-- [ ] Join/leave
-- [ ] Invite link (create/regenerate/join)
+- [x] Create group/channel
+- [x] Join/leave
+- [x] Invite link (create/regenerate/join)
 - [x] Roles owner/admin/member
-- [ ] Admin actions: add/remove/ban/unban/promote/demote
+- [x] Admin actions: add/remove/ban/unban/promote/demote
 - [x] Ограничения канала: писать только owner/admin
-- [ ] Member visibility rules (скрытие списков/действий)
+- [x] Member visibility rules (скрытие списков/действий)
 
 ## 11. Поиск
 - [ ] Глобальный поиск: users/chats/messages