fix: make fifo migrations order-safe for fresh setup

internal/database/migrations/20260228143207_disable_chickin_fifo_consumption.down.sql

@@ -1,13 +1,5 @@
 BEGIN;
 
--- Restore CHICKIN route if rollback is required.
--- NOTE: released PROJECT_CHICKIN allocations are not restored by this down migration.
-UPDATE fifo_stock_v2_route_rules
-SET is_active = TRUE,
-    updated_at = NOW()
-WHERE flag_group_code = 'AYAM'
-  AND lane = 'USABLE'
-  AND function_code = 'CHICKIN_OUT'
-  AND source_table = 'project_chickins';
+-- no-op: moved to 20260306090011_disable_chickin_fifo_consumption_after_core.down.sql
 
 COMMIT;