refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/@openzeppelin/contracts/interfaces/IERC1363Spender.sol

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363Spender.sol)
+
+pragma solidity >=0.5.0;
+
+/**
+ * @title IERC1363Spender
+ * @dev Interface for any contract that wants to support `approveAndCall`
+ * from ERC-1363 token contracts.
+ */
+interface IERC1363Spender {
+    /**
+     * @dev Whenever an ERC-1363 token `owner` approves this contract via `approveAndCall`
+     * to spend their tokens, this function is called.
+     *
+     * NOTE: To accept the approval, this must return
+     * `bytes4(keccak256("onApprovalReceived(address,uint256,bytes)"))`
+     * (i.e. 0x7b04a2d0, or its own function selector).
+     *
+     * @param owner The address which called `approveAndCall` function and previously owned the tokens.
+     * @param value The amount of tokens to be spent.
+     * @param data Additional data with no specified format.
+     * @return `bytes4(keccak256("onApprovalReceived(address,uint256,bytes)"))` if approval is allowed unless throwing.
+     */
+    function onApprovalReceived(address owner, uint256 value, bytes calldata data) external returns (bytes4);
+}