feat(M04-C): 完成续费换房与订单调整

database/migrations/2026062013_m04c_order_adjustments.down.sql

@@ -0,0 +1,8 @@
+DELETE FROM qipai_schema_migrations WHERE version = '2026062013';
+DROP TABLE IF EXISTS qipai_order_adjustments;
+ALTER TABLE qipai_orders
+  DROP COLUMN operator_note,
+  DROP COLUMN adjustment_amount_cents;
+ALTER TABLE qipai_stores
+  DROP COLUMN cancellation_fee_bps,
+  DROP COLUMN cancellation_cutoff_minutes;