feat(service): expand service layer with new domain operations

- Add IM service modules: audit, channel roles, custom emojis, forum
  tags, integrations, invitations, repo links, slash commands, stages,
  voice, webhooks
- Add PR service modules: review requests, templates
- Add repo service modules: contributors, release assets, git extras
  (archive, branch rename, commit extras, diff/merge, tag, tree)
- Add user service: social (follow/block)
- Add internal auth service
- Update existing service modules with expanded functionality
- Remove deleted IM modules: articles, delivery trace, drafts,
  follows, messages, polls, presence, reactions, threads

service/auth/logout.rs

@@ -7,8 +7,7 @@ impl AuthService {
         if let Some(user_uid) = context.user() {
             tracing::info!(user_uid = %user_uid, "User logged out");
         }
-        context.clear_user();
-        context.clear();
+        context.purge();
         Ok(())
     }
 }