style(迁移): 修正迁移脚本的 Ruff 检查问题

将等价字典构造改为字面量并标记未使用字段，保持迁移 SQL 语义。

backend/alembic/versions/25d6e7f8a9b0_monitor_permissions.py

@@ -14,8 +14,8 @@ def upgrade():
         ("system:monitor:view", "系统监控：查看", 1),
         ("system:monitor:export", "系统监控：导出", 2),
     ):
-        bind.execute(sa.text("INSERT INTO permissions (perm_code,perm_name,perm_type,sort_order,status) SELECT :code,:name,:kind,100,1 WHERE NOT EXISTS (SELECT 1 FROM permissions WHERE perm_code=:code)"), dict(code=code,name=name,kind=kind))
-        bind.execute(sa.text("INSERT INTO role_permissions (role_id,permission_id) SELECT r.id,p.id FROM roles r JOIN permissions p ON p.perm_code=:code WHERE r.role_code='admin' AND NOT EXISTS (SELECT 1 FROM role_permissions old WHERE old.role_id=r.id AND old.permission_id=p.id)"), dict(code=code))
+        bind.execute(sa.text("INSERT INTO permissions (perm_code,perm_name,perm_type,sort_order,status) SELECT :code,:name,:kind,100,1 WHERE NOT EXISTS (SELECT 1 FROM permissions WHERE perm_code=:code)"), {"code": code,"name": name,"kind": kind})
+        bind.execute(sa.text("INSERT INTO role_permissions (role_id,permission_id) SELECT r.id,p.id FROM roles r JOIN permissions p ON p.perm_code=:code WHERE r.role_code='admin' AND NOT EXISTS (SELECT 1 FROM role_permissions old WHERE old.role_id=r.id AND old.permission_id=p.id)"), {"code": code})
     bind.execute(sa.text("UPDATE permissions p JOIN permissions parent ON parent.perm_code='system:monitor:view' SET p.parent_id=parent.id WHERE p.perm_code='system:monitor:export'"))