feat: add router params

foundry/lib/PaymentsImmutables.sol

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.26;
+
+import {IWETH9} from "@uniswap/v4-periphery/src/interfaces/external/IWETH9.sol";
+import {IPermit2} from "permit2/src/interfaces/IPermit2.sol";
+
+struct PaymentsParameters {
+    address permit2;
+    address weth9;
+}
+
+contract PaymentsImmutables {
+    /// @notice WETH9 address
+    IWETH9 internal immutable WETH9;
+
+    /// @notice Permit2 address
+    IPermit2 internal immutable PERMIT2;
+
+    constructor(PaymentsParameters memory params) {
+        WETH9 = IWETH9(params.weth9);
+        PERMIT2 = IPermit2(params.permit2);
+    }
+}