fix: 修复多处代码质量问题-移除unwrap/println/dead-code/重复代码/错误吞咽

src/handlers/user.rs

@@ -17,7 +17,7 @@ pub async fn get_current_user_profile(
 
     let user = db::get_user_by_id(pool.get_ref(), user_id).await?;
     let is_paid_active = user.is_paid && 
-        (user.paid_expires_at.is_none() || user.paid_expires_at.unwrap() > chrono::Utc::now());
+        user.paid_expires_at.map_or(true, |expires| expires > chrono::Utc::now());
     
     Ok(HttpResponse::Ok().json(serde_json::json!({
         "success": true,