feat(discord): make /newsession identical to Telegram wizard

- Remove legacy DiscordNewSessionCommand/Handler and their tests.
- Rename /newsession-wizard to /newsession.
- Add shared pool capacity step before Format/Location.
- Render Format and Location in Discord wizard; Location uses a modal.
- Propagate Format, JoinLink and LocationAddress in BuildCommand.
- Publish created sessions through existing IPlatformMessenger pipeline.
- Update README, version bump to 3.11.1, sync compose/deploy/NavMenu.

.gitea/workflows/deploy.yml

@@ -6,7 +6,7 @@ on:
       - main 
 
 env:
-  VERSION: 3.11.0
+  VERSION: 3.11.1
 
 jobs:
   # ЧАСТЬ 1: Собираем образы и кладем в Gitea (чтобы делиться с ребятами)