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/user/appearance.rs

@@ -85,9 +85,17 @@ impl UserService {
         .execute(self.ctx.db.writer())
         .await
         .map_err(AppError::Database)?;
-        self.find_user_appearance(user_uid)
-            .await?
-            .ok_or(AppError::UserNotFound)
+        // Read from writer to avoid replication lag
+        sqlx::query_as::<_, UserAppearance>(
+            "SELECT user_id, theme, color_scheme, density, font_size, editor_theme, \
+             markdown_preview, reduced_motion, created_at, updated_at \
+             FROM user_appearance WHERE user_id = $1",
+        )
+        .bind(user_uid)
+        .fetch_optional(self.ctx.db.writer())
+        .await
+        .map_err(AppError::Database)?
+        .ok_or(AppError::UserNotFound)
     }
 
     async fn find_user_appearance(