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/workspace/stats.rs

@@ -43,7 +43,7 @@ impl WorkspaceService {
         .map_err(AppError::Database)?;
 
         let issues_count = sqlx::query_scalar::<_, i64>(
-            "SELECT COUNT(*) FROM issue WHERE repo_id IN (SELECT id FROM repo WHERE workspace_id = $1 AND deleted_at IS NULL) AND deleted_at IS NULL",
+            "SELECT COUNT(*) FROM issue WHERE workspace_id = $1 AND deleted_at IS NULL",
         )
         .bind(ws.id)
         .fetch_one(self.ctx.db.reader())
@@ -102,14 +102,16 @@ impl WorkspaceService {
         .execute(self.ctx.db.writer())
         .await
         .map_err(AppError::Database)?;
+        // Read from writer to avoid replication lag
         sqlx::query_as::<_, WorkspaceStats>(
             "SELECT workspace_id, members_count, repos_count, issues_count, pull_requests_count, \
              storage_bytes, bandwidth_bytes, build_minutes_used, last_activity_at, updated_at \
              FROM workspace_stats WHERE workspace_id = $1",
         )
         .bind(workspace_id)
-        .fetch_one(self.ctx.db.reader())
+        .fetch_optional(self.ctx.db.writer())
         .await
-        .map_err(AppError::Database)
+        .map_err(AppError::Database)?
+        .ok_or(AppError::NotFound("workspace stats not found".into()))
     }
 }