fix: 历史费用状态修正为「计入费用」

- data_fixes 新增 migrate_fix_expense_status
- 将 NULL/空/待审批 的费用状态统一修正为「计入费用」
- 服务启动时自动执行，幂等安全
- 版本号 v1.0.0.6

backend/migrations/__init__.py

@@ -17,7 +17,7 @@ def run_migrations():
     """
     from migrations.tables import migrate_create_tables
     from migrations.columns import migrate_add_columns
-    from migrations.data_fixes import migrate_fix_task_status, migrate_rename_tenant, migrate_drop_product_fields, migrate_fix_service_fee_standard
+    from migrations.data_fixes import migrate_fix_task_status, migrate_rename_tenant, migrate_drop_product_fields, migrate_fix_service_fee_standard, migrate_fix_expense_status
     from migrations.data_split import migrate_data_split
     from migrations.seed import migrate_seed_users, migrate_seed_demo_data
 
@@ -27,6 +27,7 @@ def run_migrations():
     migrate_rename_tenant()
     migrate_drop_product_fields()
     migrate_fix_service_fee_standard()
+    migrate_fix_expense_status()
     migrate_data_split()
     migrate_seed_users()
     migrate_seed_demo_data()