android: add channel role-based send permissions

docs/android-checklist.md

@@ -77,9 +77,9 @@
 - [ ] Create group/channel
 - [ ] Join/leave
 - [ ] Invite link (create/regenerate/join)
-- [ ] Roles owner/admin/member
+- [x] Roles owner/admin/member
 - [ ] Admin actions: add/remove/ban/unban/promote/demote
-- [ ] Ограничения канала: писать только owner/admin
+- [x] Ограничения канала: писать только owner/admin
 - [ ] Member visibility rules (скрытие списков/действий)
 
 ## 11. Поиск