fix: notifications查询type列别名与sqlx rename冲突导致500

src/handlers/notifications.rs

@@ -45,7 +45,7 @@ pub async fn list_notifications(
 
     let rows = sqlx::query_as::<_, crate::models::Notification>(
         r#"
-        SELECT id, scope, user_id, type AS type_, title, content, priority, link,
+        SELECT id, scope, user_id, type, title, content, priority, link,
                is_read, created_at, expires_at
         FROM notifications
         WHERE scope = 'all' OR (scope = 'user' AND user_id = $1)