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/im/categories.rs

@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
 use crate::error::AppError;
-use crate::immediate::{CategoryAction, CategoryEvent};
+use crate::service::im::events::{CategoryAction, CategoryEvent};
 use crate::models::channels::ChannelCategory;
 use crate::models::common::Role;
 use crate::service::ImService;