用户管理增加余额调账功能

支持后台加减可用余额并写入资金流水与审计，优化操作列按钮样式。

backend/migrations/000026_user_wallet_adjust_permission.sql

@@ -0,0 +1,27 @@
+-- +goose Up
+
+-- 新增“调整用户余额”权限：线下打款核销、补偿加款等人工余额管理。
+INSERT INTO permissions (code, name, resource, action) VALUES
+('user:wallet_adjust', '调整用户余额', 'user', 'wallet_adjust')
+ON DUPLICATE KEY UPDATE
+  name = VALUES(name),
+  resource = VALUES(resource),
+  action = VALUES(action);
+
+-- super_admin 拥有全部权限，补授新权限。
+INSERT IGNORE INTO role_permissions (role_id, permission_id)
+SELECT r.id, p.id FROM roles r, permissions p
+WHERE r.code = 'super_admin' AND p.code = 'user:wallet_adjust';
+
+-- ops（运营）负责用户管理与客服补偿，授予余额调整权限。
+INSERT IGNORE INTO role_permissions (role_id, permission_id)
+SELECT r.id, p.id FROM roles r, permissions p
+WHERE r.code = 'ops' AND p.code = 'user:wallet_adjust';
+
+-- +goose Down
+
+DELETE rp FROM role_permissions rp
+JOIN permissions p ON p.id = rp.permission_id
+WHERE p.code = 'user:wallet_adjust';
+
+DELETE FROM permissions WHERE code = 'user:wallet_adjust';