data: A3 提效对比实验数据（23 样例 + 人工基线 + 插件实测，整体提速约 266 倍）

- data/efficiency-samples/ 23 个多语言样例 + data/manual-review-tool.html 人工审核工具
- tests/measure/measure-plugin-samples.mjs 四语言插件侧测量脚本
- tests/measure/compare-a3.mjs 聚合对比 + results（插件实测/人工基线/comparison）
- performance-comparison.md 填实基线对比与结论；README 效果总结由占位改为真实数据

data/efficiency-samples/sql/sample-03.sql

@@ -0,0 +1,8 @@
+-- active-users report query
+select u.user_id,u.user_name,o.order_id,o.amount
+from t_user u
+join t_order o on u.user_id = o.user_id
+where u.status = 'active'
+  and o.created_at > sysdate - 30
+  and o.amount > 100
+ORDER BY o.amount desc