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/notify/core.rs

@@ -34,21 +34,20 @@ impl NotificationService {
         let user_id = session.user().ok_or(AppError::Unauthorized)?;
         let now = Utc::now();
 
-        sqlx::query(
+        sqlx::query_as::<_, Notification>(
             "UPDATE notification SET read_at = $1, updated_at = $2 \
-             WHERE id = $3 AND user_id = $4 AND deleted_at IS NULL",
+             WHERE id = $3 AND user_id = $4 AND deleted_at IS NULL \
+             RETURNING id, user_id, notification_type, target_type, target_id, title, body, \
+             action_url, action_text, read_at, dismissed_at, created_at, updated_at, deleted_at",
         )
         .bind(now)
         .bind(now)
         .bind(notification_id)
         .bind(user_id)
-        .execute(self.ctx.db.writer())
+        .fetch_optional(self.ctx.db.writer())
         .await
-        .map_err(AppError::Database)?;
-
-        Notification::find_by_id(self.ctx.db.reader(), notification_id, user_id)
-            .await?
-            .ok_or(AppError::NotFound("notification not found".into()))
+        .map_err(AppError::Database)?
+        .ok_or(AppError::NotFound("notification not found".into()))
     }
 
     pub async fn mark_all_as_read(&self, session: &Session) -> Result<i64, AppError> {
@@ -77,21 +76,20 @@ impl NotificationService {
         let user_id = session.user().ok_or(AppError::Unauthorized)?;
         let now = Utc::now();
 
-        sqlx::query(
+        sqlx::query_as::<_, Notification>(
             "UPDATE notification SET dismissed_at = $1, updated_at = $2 \
-             WHERE id = $3 AND user_id = $4 AND deleted_at IS NULL",
+             WHERE id = $3 AND user_id = $4 AND deleted_at IS NULL \
+             RETURNING id, user_id, notification_type, target_type, target_id, title, body, \
+             action_url, action_text, read_at, dismissed_at, created_at, updated_at, deleted_at",
         )
         .bind(now)
         .bind(now)
         .bind(notification_id)
         .bind(user_id)
-        .execute(self.ctx.db.writer())
+        .fetch_optional(self.ctx.db.writer())
         .await
-        .map_err(AppError::Database)?;
-
-        Notification::find_by_id(self.ctx.db.reader(), notification_id, user_id)
-            .await?
-            .ok_or(AppError::NotFound("notification not found".into()))
+        .map_err(AppError::Database)?
+        .ok_or(AppError::NotFound("notification not found".into()))
     }
 
     pub async fn delete_notification(