Add atomic DODO seeding helper

contracts/dex/DODOAtomicSeeder.sol

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+interface IERC20AtomicSeeder {
+    function transferFrom(address from, address to, uint256 amount) external returns (bool);
+}
+
+interface IDODOAtomicSeedPool {
+    function buyShares(address to) external returns (uint256 baseShare, uint256 quoteShare, uint256 lpShare);
+}
+
+/**
+ * @title DODOAtomicSeeder
+ * @notice Pulls both DODO DVM seed tokens and mints LP shares in one transaction.
+ * @dev This avoids exposing half-seeded pools between separate ERC-20 transfers.
+ */
+contract DODOAtomicSeeder {
+    error TransferFromFailed(address token);
+    error ZeroAddress();
+
+    function seed(
+        address pool,
+        address baseToken,
+        address quoteToken,
+        uint256 baseAmount,
+        uint256 quoteAmount,
+        address recipient
+    ) external returns (uint256 baseShare, uint256 quoteShare, uint256 lpShare) {
+        if (pool == address(0) || baseToken == address(0) || quoteToken == address(0) || recipient == address(0)) {
+            revert ZeroAddress();
+        }
+
+        _safeTransferFrom(baseToken, msg.sender, pool, baseAmount);
+        _safeTransferFrom(quoteToken, msg.sender, pool, quoteAmount);
+        return IDODOAtomicSeedPool(pool).buyShares(recipient);
+    }
+
+    function _safeTransferFrom(address token, address from, address to, uint256 amount) internal {
+        if (amount == 0) return;
+        (bool ok, bytes memory data) = token.call(
+            abi.encodeWithSelector(IERC20AtomicSeeder.transferFrom.selector, from, to, amount)
+        );
+        if (!ok || (data.length != 0 && !abi.decode(data, (bool)))) {
+            revert TransferFromFailed(token);
+        }
+    }
+}